Patent Date Title Inventor Assignee
1364158January 4, 1921Method of and apparatus for testing repeater-circuitsTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1364965January 11, 1921Telephone-call-transfer systemTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1364964January 11, 1921Means for controlling repeatersTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1365734January 18, 1921Electron-tube-testing circuitsSHACKLETON SAMUEL P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1365710January 18, 1921Collapsible wire-reelMCILWAIN HERBERT A. ; WRIGHT JOHN W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1366414January 25, 1921Means for and method of measuring weak currentsOSBORNE HAROLD S. ; MARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1367571February 8, 1921Transmission-equalization arrangementTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1368296February 15, 1921Anchoring deviceSKED NORMAN S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1368288February 15, 1921Electromagnetic devicePIERCE RALPH E.AMERICAN TELEPHONE
TELEGRAPH COMPANY
1369403February 22, 1921Testing apparatusDEMAREST CHARLES S. ; SHOFFSTALL HUGH F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1369003February 22, 1921Semimechanical switchboardBLAUVELT WILLIAM G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1369828March 1, 1921Cable-hangerMATTHEWS EDGAR M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1369805March 1, 1921Secret-communication systemHAMILTON BAXTER P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1370669March 8, 1921Machine-telegraphPOTTS LOUIS M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1370562March 8, 1921Trunk-circuitsSHACKLETON SAMUEL P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1370558March 8, 1921Machine ringing systemRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1371298March 15, 1921Telephone and call signal systemCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1372050March 22, 1921Busy-signal-testing apparatusTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1372042March 22, 1921Desk operator's circuitsRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1372838March 29, 1921Pole-derrickSMITH TEMPLE C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1373504April 5, 1921Electrical measuring apparatusHITCHCOCK HARRY W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1374219April 12, 1921Composite transmission systemOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1375414April 19, 1921Apparatus for testing capacity deviations and unbalance of electric conductorsOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1375405April 19, 1921Apparatus for testing capacity of electric conductorsMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1383750July 5, 1921Alternating-current signaling systemPARKER RALZEMOND D. ; HAMILTON BAXTER P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1384994July 19, 1921Telephone repeater equipmentDEMAREST CHARLES S. ; CLARK ALVA B. ; CRISSON GEORGEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1385777July 26, 1921Grid-circuits for electron-tubesCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1386977August 9, 1921Indicating mechanismWATSON EDWARD F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1389596September 6, 1921Desk operator's circuitsRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1390580September 13, 1921Means for reducing interferenceOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1390545September 13, 1921Desk operator's circuitsRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1391552September 20, 1921Repeater cord-circuitsLOYNES OWEN H. ; ROSE ARTHUR F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1391006September 20, 1921Half-duplex alternating-current telegraph systemPARKER RALZEMOND D.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1392179September 27, 1921Operator's trunk-circuitKUHN GEORGE W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1392152September 27, 1921Multiple-station transmission-circuitsHARDEN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1394190October 18, 1921Testing system for four-wire circuitsDEMAREST CHARLES SAMERICAN TELEPHONE & TELEGRAPH
1394189October 18, 1921Repeater-controlling system for four-wire circuitsDEMAREST CHARLES S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1394062October 18, 1921Means for and method of reducing cross-talk in four-wire circuitsBLACKWELL OTTO B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1395007October 25, 1921Telegraph systemPOST ARTHUR W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1395854November 1, 1921Balancing signaling systemsMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1397228November 15, 1921Electrical measuring apparatusNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1397093November 15, 1921Radiorepeating systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1397991November 22, 1921Message-registering systemTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1397975November 22, 1921Electrical testing systemKUHN GEORGE W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1398287November 29, 1921Selective signaling systemTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1398266November 29, 1921Electrical indicating and measuring deviceHITCHCOCK HARRY W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1399695December 6, 1921Electrical testing-circuitsDEMAREST CHARLES S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1399226December 6, 1921Electrothermal relayRHODES WILLIAM AAMERICAN TELEPHONE & TELEGRAPH
1400189December 13, 1921Means for controlling repeater-circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1400776December 20, 1921Deflection-dynamometerSMITH TEMPLE C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1400732December 20, 1921Signaling systemDEMAREST CHARLES S. ; JR. JOHN DAVIDSON,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1400583December 20, 1921Telephone systemTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1402322January 3, 1922Anti-side-tone hand setTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1402202January 3, 1922Ringing arrangement for multiplex circuitsAFFEL HERMAN A. ; JR. JOHN DAVIDSON,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1402991January 10, 1922Carrier telegraph circuitAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1403841January 17, 1922Frequency-control systemCARSON JOHN R.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1403626January 17, 1922Automatic switch for controlling motor-driven automatic machinesPOTTS LOUIS M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1403544January 17, 1922Transmission equalization arrangementDARROW WIRT E.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1404799January 31, 1922Current-supply circuit for vacuum bulbsSHACKLETON SAMUEL PAMERICAN TELEPHONE & TELEGRAPH
1405501February 7, 1922Repeater-network-selecting apparatusDEMAREST CHARLES SAMERICAN TELEPHONE & TELEGRAPH
1405428February 7, 1922Signal-transmitting systemOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1406918February 14, 1922Testing systemBLAUVELT WILLIAM G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1406246February 14, 1922Testing and adjusting apparatus for cord circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1406195February 14, 1922Testing apparatus for telephone-switchboard cordsKUHN GEORGE W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1407046February 21, 1922Telephone apparatusTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1407028February 21, 1922Transmission-equalization arrangementHARPER ALFRED U.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1406998February 21, 1922Signaling systemOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1408567March 7, 1922Transmission equalization arrangementDARROW LEO H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1410088March 21, 1922Screw driverWHITE RALPH HAMERICAN TELEPHONE & TELEGRAPH
1410003March 21, 1922Repeater apparatusDEMAREST CHARLES S. ; LOYNES OWEN H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1409913March 21, 1922Message-register systemAVERY FREDERICKAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1410890March 28, 1922Method of and means for modulating carrier oscillationsCARSON JOHN R.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1410545March 28, 1922Intercommunicating systemMARROWS LEON DWIGHTAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1411385April 4, 1922Signaling apparatusSHACKLETON SAMUEL P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1412490April 11, 1922Signaling systemRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1412458April 11, 1922Message-registering systemDARROW LEO H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1412908April 18, 1922Synchronizing systemDYILE MARL B. VANAMERICAN TELEPHONE AND TELECRAPH COMPANY
1412853April 18, 1922Synchronizing systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1413753April 25, 1922Receiving device for signaling systemsMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1413708April 25, 1922Signaling circuits for toll linesJR. JOHN DAVIDSON,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1414397May 2, 1922Testing apparatusBEST FRED H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1414391May 2, 1922Means for and method of testing unbalanceAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1415106May 9, 1922Ciphering deviceMOREHOUSE LYMAN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1415098May 9, 1922Heater for soldering coppersKLEIN CHARLES H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1415907May 16, 1922Means for equalizing transmission over lines of different electrical charactrristicsTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1415868May 16, 1922Transmission-equalization arrangementDARROW LEO H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1416765May 23, 1922Ciphering deviceVERNAM GILBERT S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1416724May 23, 1922Telephone circuitsKUHN GEORGE W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1418285June 6, 1922Translating circuitCARSON JOHN R.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1419674June 13, 1922Electrical measuring apparatusHITCHCOCK HARRY W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1419673June 13, 1922Electrical measuring apparatusHITCHCOCK HARRY W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1419409June 13, 1922System of telegraph distributionPOTTS LOUIS M.AMERICAN TELEPHONE
TELEGRAPH COMPANY
1420487June 20, 1922HookKENT ROBERT JAMERICAN TELEPHONE & TELEGRAPH
1421702July 4, 1922Testing apparatusMCCURDY RALPH G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1422470July 11, 1922Inductive-interference-suppression deviceOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1423518July 25, 1922Frequency regulatorESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1426669August 22, 1922Ciphering devicePIERCE RALPH E.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1427725August 29, 1922Switchboard call-signal apparatus and circuitsCOOPER LESTER W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1427695August 29, 1922Switchboard call-signal apparatus and circuitsMORRIS ROBERT W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1428156September 5, 1922Low-frequency amplifierESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1427923September 5, 1922Telephone-call circuitsTOOMEY JOHN F. ; LOYNES OWEN H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1428667September 12, 1922Testing and adjusting apparatus for cord circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1428631September 12, 1922Testing and adjusting apparatus for cord circuitsHARRISON WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1429264September 19, 1922Calculating guy ruleWRIGHT JOHN W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1429248September 19, 1922Multiplex signaling systemOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1429972September 26, 1922Desk operator's circuitsRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1429931September 26, 1922Signaling circuits for toll linesJR. JOHN DAVIDSON,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1430808October 3, 1922Two-way impedance equalizer for transformersHOYT RAY S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1430531October 3, 1922Apparatus for moldingBERRYMAN DAVIDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1431219October 10, 1922Electron-tube repeaterCRISSON GEORGEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1431195October 10, 1922Telephone-exchange systemTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1431995October 17, 1922Signaling apparatus and circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1431921October 17, 1922Brake for rolling laddersBARNES HARRY F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1432829October 24, 1922Electrical testing systemBEST FRED H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1433599October 31, 1922RadiocircuitBOWN RALPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1433594October 31, 1922Telephone-exchange systemBAILEY RAND S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1434555November 7, 1922Wave filterMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1434518November 7, 1922Telephone-exchange systemBAILEY RAND S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1435348November 14, 1922Automatic ringing circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1435328November 14, 1922Distortion-measuring apparatusNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1435980November 21, 1922Means for and method of reducing cross talk in four-wire circuitsRENSHAW RICHARD A.AMERICAN TELEPHONE AND TELECRAPH COMPANY
1435968November 21, 1922Telephone trunk circuitsKUHN GEORGE W. ; LUNDIUS ERIC R.AMERICAN TELEPHONE AND TELECRAPH COMPANY
1436733November 28, 1922Carriage for conveying drums of electric cablesSMITH TEMPLE C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1436683November 28, 1922Battery supply circuits for repeatersROSE ARTHUR F.AMERICAN TELEPHONE
TELEGRAPH COMPANY
1437457December 5, 1922Signaling apparatus and circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1438270December 12, 1922Means for regulating the transmission over four-wire circuitsSHACKLETON SAMUEL P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1438220December 12, 1922Means for and method of regulating the transmission over electric circuitsCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1438219December 12, 1922Means for and method of regulating the transmission over electric circuitsCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1438218December 12, 1922Means for and method of regulating the transmission over electric circuitsCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1438217December 12, 1922Means for and method of regulating the transmission over electric circuitsCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1438989December 19, 1922High-frequency translating circuitsESPENSCHIED LLOYD ; AFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1438988December 19, 1922High-frequency translating circuitsESPENSCHIED LLOYD ; AFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1439772December 26, 1922Signaling apparatus and circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1439723December 26, 1922Numbering system for automatic telephone exchangesBLAUVELT WILLIAM G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1440407January 2, 1923Detecting ciscuitsOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1441827January 9, 1923Signaling systemBLACKWELL OTTO B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1441270January 9, 1923Transmission systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1442819January 23, 1923Ciphering machinePARKER RALZEMOND DAMERICAN TELEPHONE & TELEGRAPH
1443985February 6, 1923Signaling systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1444830February 13, 1923Transmission-controlling apparatusDEMAREST CHARLES S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1445759February 20, 1923Means for and method of testing multiplex carrier circuitsJR. JOHN DAVIDSON,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1446526February 27, 1923Ringing regulatorTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1447773March 6, 1923Radio transmission control systemESPENSCHIED LLOYD ; BOWN RALPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1447204March 6, 1923Plural modulation and demodulation circuitsESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1448702March 13, 1923Translating circuitsCARSON JOHN R.AMERICAN TELEPHONE AND TELEGRAPH CO.
1448116March 13, 1923Connector for electrical conductorsHAISLIP RICHARD A. ; MATTHEWS EDGAR M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1449945March 27, 1923Wire gripMORRIS JACOBSENAMERICAN TELEPHONE & TELEGRAPH
1449382March 27, 1923Method and means for signaling with high-frequency wavesCARSON JOHN R.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1450305April 3, 1923Telephone signaling systemRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1450254April 3, 1923Balancing arrangement for multiplex carrier circuitsESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1450969April 10, 1923Receiving circuits for weak signal currentsCARSON JOHN R.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1450966April 10, 1923Synchronizing systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1451767April 17, 1923Composite ringer for multiplex-transmission systemsESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1451746April 17, 1923Multiplex selecting circuitsSULTZER MORTONAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1452548April 24, 1923Manhole-platform supportCONLEE CARLTON N.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1452527April 24, 1923Transmitting apparatus for electric telegraphsPOTTS LOUIS M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1454011May 1, 1923System for attaining uniform attenuationBLACKWELL OTTO B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1453980May 1, 1923Attenuation equalizerHOYT RAY S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1453430May 1, 1923Voice-operated relayBLACKWELL OTTO B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1453387May 1, 1923System for communicating with moving vehiclesESPENSCHIED LLOYD ; AFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1454159May 8, 1923Means for ringing over multiplex transmission channelsESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1454158May 8, 1923Means for ringing over multiplex transmission channelsESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1454895May 15, 1923Electrolysis mitigationJONES GEORGE G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1454840May 15, 1923Means for ringing over multiplex transmission channelsAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRPAH COMPANY
1455843May 22, 1923System for measuring distrotionKIRKWOOD MACLEANAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1455827May 22, 1923Selective circuit for multiplex transmissionAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1456556May 29, 1923Duplex telegraph systemHUDSON EARL A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1456549May 29, 1923Composite signaling circuitsHAMILTON BAXTER P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1457338June 5, 1923Selective connection of trunk linesBARROWS LEON D. ; DARROW LEO H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1457336June 5, 1923Balancing circuitsAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1458193June 12, 1923Multiple balancing arrangement for multiplex transmissionOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1459005June 19, 1923Means for equalizing transmission over lines of different electrical characteristicsTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1459004June 19, 1923Means for equalizing transmission over lines of different electrical characteristicsTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1459003June 19, 1923Means for equalizing transmission over lines of different electrical characteristicsTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1458988June 19, 1923Means for equalizing transmission over lines of different electrical characteristicsMOREHOUSE LYMAN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1459770June 26, 1923System for testing line balanceJONES ALVA J.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1461492July 10, 1923Electrical testing instrumentMOODY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1461064July 10, 1923Multiplex transmission circuitMARTIN DE LOSS K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1461790July 17, 1923Maximum-voltage indicatorSULTZER MORTONAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1461783July 17, 1923Secret-communication systemPARKER RALZEMOND D. ; HAMILTON BAXTER P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1462526July 24, 1923Composite ringer setTOOMEY JOHN F. ; HARRISON WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1462525July 24, 1923Arrangement for producing complementary visual and audisle exhibitionsTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1463200July 31, 1923Ringing arrangement for multiplex circuitsDAVIDSON JR JOHNAMERICAN TELEPHONE & TELEGRAPH
1463199July 31, 1923Ringing arrangement for multiplex circuitsDAVIDSON JR JOHNAMERICAN TELEPHONE & TELEGRAPH
1463796August 7, 1923Translating circuitsCARSON JOHN RAMERICAN TELEPHONE AND TELEPGR
1463795August 7, 1923Translating circuitCARSON JOHN RAMERICAN TELEPHONE & TELEGRAPH
1464565August 14, 1923Call system for radiotelephonyLLOYD ESPENSCHIED ; RALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1464563August 14, 1923Repeater-control arrangementDEMAREST CHARLES S ; LOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1465299August 21, 1923Low-frequency alternating-current signaling systemLLOYD ESPENSCHIED ; TOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1466007August 28, 1923Wire gripWALTON CLIFFORD JAMERICAN TELEPHONE & TELEGRAPH
1465972August 28, 1923Transmission regulating circuitsGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1466708September 4, 1923Transmission systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1466707September 4, 1923Method of and apparatus for limiting the transmission of electrical energyLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1467458September 11, 1923Signaling circuitsTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1467360September 11, 1923Wave filterELSASSER HENRY WAMERICAN TELEPHONE & TELEGRAPH
1468101September 18, 1923Testing circuitsCLARK ALVA B ; GEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1468096September 18, 1923Storage-battery circuitYOUNG ROWLAND LAMERICAN TELEPHONE & TELEGRAPH
1468687September 25, 1923Transmission regulationAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1469259October 2, 1923Carrier telegraph circuitsHAMILTON BAXTER PAMERICAN TELEPHONE & TELEGRAPH
1469254October 2, 1923Carrier telegraph circuitsWARNER DEARDORFF RALPHAMERICAN TELEPHONE & TELEGRAPH
1469253October 2, 1923Carrier telegraph circuitsWARNER DEARDORFF RALPHAMERICAN TELEPHONE & TELEGRAPH
1470632October 16, 1923Equalizing transmissionMARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1470611October 16, 1923Telephone-exchange systemBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1470594October 16, 1923Secret signaling systemBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1471388October 23, 1923Signaling circuitEGINHARD DIETZEAMERICAN TELEPHONE & TELEGRAPH
1471383October 23, 1923Method of and means for measuring unbalanceCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1472087October 30, 1923Gas-heated soldering ironPIKE VERNON BAMERICAN TELEPHONE & TELEGRAPH
1472035October 30, 1923Means for signaling over multiplex transmission channelsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1472822November 6, 1923Calling arrangement for radio systemsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1472821November 6, 1923Ringing channel for multiplex telephone systemsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1473682November 13, 1923Repeater apparatus for carrier systemsOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1473674November 13, 1923Means for and method of modulationLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1473671November 13, 1923Telephone-exchange systemDAVIDSON JR JOHNAMERICAN TELEPHONE & TELEGRAPH
1474426November 20, 1923Secret-communication systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1474408November 20, 1923Detecting circuitWARNER DEARDORFF RALPHAMERICAN TELEPHONE & TELEGRAPH
1476003December 4, 1923Radiosignaling call systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1475987December 4, 1923Single-transmission telegraph systemCUSHING WILLIAM AAMERICAN TELEPHONE & TELEGRAPH
1476721December 11, 1923Frequency-control systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1476689December 11, 1923Electrical testing systemCHAPMAN ARTHUR GAMERICAN TELEPHONE & TELEGRAPH
1476678December 11, 1923Demodulating apparatusAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1477609December 18, 1923Telephone-receiver attachmentTHOMPSON GEORGE KAMERICAN TELEPHONE & TELEGRAPH
1477596December 18, 1923Means for supporting aerial cablesRHODES FREDERICK LAMERICAN TELEPHONE & TELEGRAPH
1477528December 18, 1923SignalingAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1478458December 25, 1923Network controlling circuitsDON SMITHAMERICAN TELEPHONE & TELEGRAPH
1478419December 25, 1923Machine-switching telephone-exchange systemBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1478412December 25, 1923Telegraph apparatusWALTON CECIL EAMERICAN TELEPHONE & TELEGRAPH
1479846January 8, 1924Ciphering deviceVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1480614January 15, 1924Telephone repeaterJACOBS OLIVER B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1480612January 15, 1924Multiplex signaling systemHITCHCOCK HARRY W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1481289January 22, 1924Electrolysis mitigationJONES GEORGE G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1481284January 22, 1924Means for and method of amplitude selectionDEARDORFF RALPH W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1482557February 5, 1924Composite signaling systemHAMILTON BAXTER P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1483172February 12, 1924Signaling systemGANNETT DANFORTH K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1483133February 12, 1924Electrical testing systemTOOMEY JOHN F. ; CRISSON GEORGEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1483956February 19, 1924Telephone systemTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1483930February 19, 1924Transmission-equalization arrangementDARROW LEO H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1484988February 26, 1924Public-address circuitsHAMILTON HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1484707February 26, 1924Relay and circuits thereforGANNETT DANFORTH K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1485773March 4, 1924Radio calling or signalingESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1488207March 25, 1924Signaling systemKUHN GEORGE W. ; RAMSDELL ROGER G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1488167March 25, 1924Signaling systemRAMSDELL ROGER G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1488847April 1, 1924Telephone systemTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1490166April 15, 1924Carrier telegraph circuitsESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1490165April 15, 1924Balanced antenna systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1490993April 22, 1924Apparatus and circuits for preventing side toneTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1491867April 29, 1924Electrical switching deviceKUHN GEORGE WAMERICAN TELEPHONE & TELEGRAPH
1491848April 29, 1924Artificial lineGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1492868May 6, 1924Telephone systemTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1493619May 13, 1924Carrier-transmission systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1493600May 13, 1924Wave filterCAMPBELL GEORGE AAMERICAN TELEPHONE & TELEGRAPH
1494382May 20, 1924Means for preventing electrical interferenceSHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1494347May 20, 1924High-speed radio systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1495226May 27, 1924Detecting circuitsHAMILTON BAXTER PAMERICAN TELEPHONE & TELEGRAPH
1496014June 3, 1924Multichannel circuitsOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1496848June 10, 1924Selective-signaling systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1496847June 10, 1924Telephone-exchange systemHOFFMANN HENRY LAMERICAN TELEPHONE & TELEGRAPH
1497714June 17, 1924Secret-communication systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1498915June 24, 1924Artificial lineHOYT RAY SAMERICAN TELEPHONE & TELEGRAPH
1498592June 24, 1924Telephone systemTOOMEY JOHN F ; LOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1498568June 24, 1924Equalization of carrier transmissionsOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1499464July 1, 1924Transmission-regulating circuitsLOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1499438July 1, 1924System of communication with moving vehiclesAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1500553July 8, 1924Harmonic suppressorLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1500552July 8, 1924Multiplex transmission systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1501104July 15, 1924Multiplex radio systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1501103July 15, 1924Conjugate signaling circuitsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1501959July 22, 1924Loaded transmission circuitsMARTIN WILLIAM H ; THOMAS SHAWAMERICAN TELEPHONE & TELEGRAPH
1501926July 22, 1924Loaded transmission circuitTHOMAS SHAWAMERICAN TELEPHONE & TELEGRAPH
1502816July 29, 1924High-frequency multiplex signaling systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1502815July 29, 1924High-frequency multiplex signaling systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1502813July 29, 1924High-frequency multiplex signaling systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1502812July 29, 1924High-frequency multiplex signaling systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1504135August 5, 1924Telephone repeater circuitsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1504124August 5, 1924Electrical testing systemKUHN GEORGE WAMERICAN TELEPHONE & TELEGRAPH
1504535August 12, 1924Multiplex transmission channelAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1504319August 12, 1924Testing apparatusBEST FRED HAMERICAN TELEPHONE & TELEGRAPH
1504303August 12, 1924Method of and means for reducing static disturbancesAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1505231August 19, 1924Signaling systemTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1505158August 19, 1924Frequency-control systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1507178September 2, 1924Method of and means for reducing interference in transmission systemsHITCHCOCK HARRY WAMERICAN TELEPHONE & TELEGRAPH
1507160September 2, 1924Pilot-wire regulator systemGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1508425September 16, 1924Telephone private branch exchange circuitsTOOMEY JOHN F ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1508424September 16, 1924Telephone desk setTHOMPSON GEORGE KAMERICAN TELEPHONE & TELEGRAPH
1509184September 23, 1924Multiple-band wave filterZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1509139September 23, 1924Radio receiving apparatusDAVID GRIMESAMERICAN TELEPHONE & TELEGRAPH
1509901September 30, 1924Electrical measuring systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1509886September 30, 1924Printing-telegraph systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1511015October 7, 1924Transmission regulationAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1511014October 7, 1924Transmission regulationAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1511013October 7, 1924Equalization of carrier transmissionsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1510985October 7, 1924Transmission regulationLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1511756October 14, 1924Electrical testing systemCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1511755October 14, 1924Electrical testing systemCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1511629October 14, 1924Electrical testing systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1511360October 14, 1924Anti-inductive systemOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1511326October 14, 1924Duplex telegraphyFELL JOHN MAMERICAN TELEPHONE & TELEGRAPH
1512087October 21, 1924Buckle for safety strapsFISH LEWIN BAMERICAN TELEPHONE & TELEGRAPH
1512070October 21, 1924Printing telegraphyVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1513453October 28, 1924Half-duplex morse carrier systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1513452October 28, 1924Half-duplex morse carrier systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1513451October 28, 1924Half-duplex morse carrier systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1513450October 28, 1924Half-duplex morse carrier systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1513441October 28, 1924Half-duplex morse carrier systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1512953October 28, 1924Arrangement for protecting electrical contactsSHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1512930October 28, 1924Signaling systemHITCHCOCK HARRY WAMERICAN TELEPHONE & TELEGRAPH
1513760November 4, 1924Foreign-potential-detecting deviceMARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1514648November 11, 1924Directive radio systemRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1514645November 11, 1924Private-branch-exchange circuitsBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1515660November 18, 1924Measuring instrument for vacuum tubesGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1517315December 2, 1924Telephone-exchange systemRHODES WILLIAM AAMERICAN TELEPHONE & TELEGRAPH
1518543December 9, 1924Electrical measuring apparatusHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1518495December 9, 1924Selective circuitsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1519574December 16, 1924Method of testing transmission linesCLARK ALVA B ; MARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1519573December 16, 1924Voice-frequency signalingCLARK ALVA B ; GANNETT DANFORTH K ; HARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1519211December 16, 1924Loud-speaker circuitsMARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1519202December 16, 1924Telegraph systemJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1520098December 23, 1924Signaling systemTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1520097December 23, 1924Selective signaling systemTHOMPSON GEORGE KAMERICAN TELEPHONE & TELEGRAPH
1520813December 30, 1924Selective circuits for multiplex transmissionLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1520793December 30, 1924Current-regulating deviceYOUNG ROWLAND LAMERICAN TELEPHONE & TELEGRAPH
1522268January 6, 1925Automatic telegraph repeaterPOTTS LOUIS M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1522044January 6, 1925Secret-communication systemBOWN RALPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1521685January 6, 1925Carrier telegraph circuitsHAMILTON BAXTER P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1521674January 6, 1925Carrier telegraph circuitsESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1521664January 6, 1925Testing circuits for echo suppressorsWRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1522581January 13, 1925Radio broadcasting systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1522580January 13, 1925Composited multiplex transmission systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1523488January 20, 1925Telegraph signal circuitsMOORE ROBERT P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1523473January 20, 1925Repeater circuitsCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1524379January 27, 1925Telephone-exchange systemBAILEY RAND S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1524357January 27, 1925TelegraphyHUDSON GEORGE E.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1525054February 3, 1925Power and amplifying equipment for distribution of intelligence over wiresTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1525053February 3, 1925Program transmission over wiresTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1525523February 10, 1925Printing telegraphyVERNAM GILBERT S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1525522February 10, 1925Printing telegraph systemVERNAM GILBERT SANFORDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1526402February 17, 1925Loop circuits for telegraph repeatersWATSON EDWARD F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1526348February 17, 1925Two-party signaling systemJR. JAMES M. LABAUGH,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1527345February 24, 1925Electrical testing deviceBIRCHALL BENJAMIN H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1527318February 24, 1925InsulatorLEWIS EDWINAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1528011March 3, 1925Radio signaling systemDEMAREST CHARLES S. ; ALMQUIST MILTON L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1528010March 3, 1925Radio signaling systemDEMAREST CHARLES S. ; ALMQUIST MILTON L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1528982March 10, 1925Trunking systemMOLINA EDWARD C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1528920March 10, 1925Trunking systemFOSTER RONALD M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1528907March 10, 1925Trunking systemBASCOM HENRY M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1529801March 17, 1925Multiplex submarine cableMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1529786March 17, 1925Secret communication systemHARPER ALFRED U.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1530548March 24, 1925SignalingESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1530537March 24, 1925Electrical transposition systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1531360March 31, 1925Telephone systemTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1531347March 31, 1925RelayRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1532172April 7, 1925Means for receiving weak signal currentsCARSON JOHN R.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1532169April 7, 1925Method of and means for measuring transmissionBEST FRED H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1533105April 14, 1925Electric signalingEGGERS HENRY C. T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1533091April 14, 1925Duplex signaling systemBLACKWELL OTTO B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1534661April 21, 1925System of telegraphic distributionPOTTS LOUIS M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1534660April 21, 1925System of telegraphic distributionPOTTS LOUIS M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1534118April 21, 1925Method of adjusting balance between electrical conductors or networksHITCHCOCK HARRY W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1534074April 21, 1925TelegraphyPARKER RALZEMOND D.AMERICAN TELEPHONE AND TELEPGRAPH COMPANY
1535269April 28, 1925Selective signaling apparatus and circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1535244April 28, 1925TelegraphyPERCIVAL HARRY S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1535104April 28, 1925Means for preventing electrical interferenceCORY SAMUEL I.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1536130May 5, 1925Operation of printing apparatus by radioPERRY DONALD B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1536118May 5, 1925Sound reproducerMCCUTCHEN BRUNSON S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1536116May 5, 1925Sound reproducerMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1537283May 12, 1925Repeater for multiplex systemsAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1537126May 12, 1925Loud-speaker circuitMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1537109May 12, 1925Telephone systemJR. JOHN DAVIDSON,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1537106May 12, 1925Means for and metho of equalizing attenuationAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1538001May 19, 1925Current-measuring arrangementPIERCE RALPH EAMERICAN TELEPHONE & TELEGRAPH
1537990May 19, 1925Method of improving broadcast receptionLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1537986May 19, 1925Telephone repeater equipmentGEORGE CRISSON ; SHACKLETON SAMUEL PAMERICAN TELEPHONE & TELEGRAPH
1538964May 26, 1925Wave filterZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1538960May 26, 1925Alternating-current relayTHOMPSON ELMER OAMERICAN TELEPHONE & TELEGRAPH
1538948May 26, 1925TransformerHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1539920June 2, 1925Signaling systemTAGGART DAWSON MAMERICAN TELEPHONE & TELEGRAPH
1539902June 2, 1925Carrier transmission over power circuitsHONAMAN RICHARD KAMERICAN TELEPHONE & TELEGRAPH
1540858June 9, 1925BrushPITCHER JAMES LAMERICAN TELEPHONE & TELEGRAPH
1540849June 9, 1925Signal-storing arrangementLOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1541881June 16, 1925Single polar telegraph circuitsWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1541880June 16, 1925Single polar telegraph circuitsWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1541879June 16, 1925Single polar telegraph circuitsWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1541878June 16, 1925Single polar telegraph circuitsWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1542922June 23, 1925Telephone receiverTHOMPSON GEORGE KAMERICAN TELEPHONE & TELEGRAPH
1542849June 23, 1925Signaling systemBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1543789June 30, 1925Printing-telegraph exchange systemPARKER RALZEMOND D ; VERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1543775June 30, 1925Apparatus for neutralizing radiointerference on wire linesILGENFRITZ LESTER MAMERICAN TELEPHONE & TELEGRAPH
1543772June 30, 1925Apparatus for neutralizing radiointerference on wire linesHUNTER RUSSELL NAMERICAN TELEPHONE & TELEGRAPH
1544737July 7, 1925Elimination of interference in carrier systemsGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1544638July 7, 1925Telegraph signaling systemFELL JOHN MAMERICAN TELEPHONE & TELEGRAPH
1544622July 7, 1925Elimination of interference in carrier systemsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1545558July 14, 1925Tandem-operated echo suppressorHAMILTON HAROLD S ; WRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1545549July 14, 1925Tandem-operated echo suppressorCHILD BRADLEY LAMERICAN TELEPHONE & TELEGRAPH
1545541July 14, 1925Tandem-operated echo suppressorWRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1546439July 21, 1925Secret telephone systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1546432July 21, 1925Relay and circuits thereforBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1546427July 21, 1925Auxiliary signaling circuitsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1546395July 21, 1925Duplex signaling systemMARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1546392July 21, 1925Testing apparatusMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1547242July 28, 1925Carrier transmission over power circuitsSTRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1547232July 28, 1925Multiplex signaling systemPARKER RALZEMOND DAMERICAN TELEPHONE & TELEGRAPH
1547227July 28, 1925Telegraph signaling systemMITCHINER JAMES IAMERICAN TELEPHONE & TELEGRAPH
1547226July 28, 1925SignalingMARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1547217July 28, 1925Phase regulator for multifrequency generatorsJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1548260August 4, 1925Multiplex systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1548119August 4, 1925Busy-test circuit for telephone cord circuitsEGINHARD DIETZEAMERICAN TELEPHONE & TELEGRAPH
1548110August 4, 1925Telephone toll circuitsTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1548095August 4, 1925Vacuum-tube translating deviceOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1548088August 4, 1925Telegraph circuitsJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1548059August 4, 1925Electrical testing systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1548895August 11, 1925Electrical transmission of picturesPIERRE MERTZAMERICAN TELEPHONE & TELEGRAPH
1548878August 11, 1925Electrical signaling systemGANNETT DANFORTH K ; MACLEAN KIRKWOODAMERICAN TELEPHONE & TELEGRAPH
1548874August 11, 1925Telegraph signaling systemFELL JOHN M ; PIERCE RALPH EAMERICAN TELEPHONE & TELEGRAPH
1548873August 11, 1925Telegraph signaling systemFELL JOHN MAMERICAN TELEPHONE & TELEGRAPH
1548862August 11, 1925Interference-neutralizing arrangementBLACKWELL OTTO BAMERICAN TELEPHONE & TELEGRAPH
1549849August 18, 1925Voice frequency carrier telegraphAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1549821August 18, 1925Printing-telegraph systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1549817August 18, 1925Trouble-indicating arrangementTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1549816August 18, 1925Program-transmission over wiresTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1550684August 25, 1925Prevention of overloading in speech circuitsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1550660August 25, 1925Prevention of overloading in speech circuitsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1550659August 25, 1925Supervisory circuits for multiplex signalingAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1550658August 25, 1925Ringing circuits for multiplex signalingAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1550657August 25, 1925Ringing circuits for multiplex signalingAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1551603September 1, 1925Adjustable mold for making plastic formsMELOSI HUGO E ; GRAY JOSEPH HAMERICAN TELEPHONE & TELEGRAPH
1551595September 1, 1925Alternating-current printing-telegraph systemWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1552499September 8, 1925Means for measuring telegraph distortionHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1552470September 8, 1925Means for measuring telegraph distortionCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1552467September 8, 1925Means and method for measuring direct capacitiesCAMPBELL GEORGE AAMERICAN TELEPHONE & TELEGRAPH
1552466September 8, 1925Means and method for measuring balanced terminal capacitiesCAMPBELL GEORGE AAMERICAN TELEPHONE & TELEGRAPH
1552465September 8, 1925Means and method for measuring direct capacitiesCAMPBELL GEORGE AAMERICAN TELEPHONE & TELEGRAPH
1553489September 15, 1925Telephone systemTOOMEY JOHN F ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1553465September 15, 1925Testing apparatusOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1553454September 15, 1925Radio repeating systemMARTIN DE LOSS K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1553435September 15, 1925Means to control cross talkCHAPMAN ARTHUR G ; MCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1553417September 15, 1925Printing-telegraph systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1554290September 22, 1925Carrier telegraph systemPARKER RALZEMOND D ; HAMILTON BAXTER PAMERICAN TELEPHONE & TELEGRAPH
1554266September 22, 1925Detecting circuitsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1554190September 22, 1925Detecting circuitsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1554189September 22, 1925Equalization of carrier transmissionAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1554188September 22, 1925High-frequency multiplex-signaling systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1555041September 29, 1925Distortion-measuring systemVERNAM GILBERT S ; PERRY DONALD B ; CORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1555037September 29, 1925Resistance amplifierSTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1555002September 29, 1925Telephone-exchange systemGRAY ERNEST AAMERICAN TELEPHONE & TELEGRAPH
1555001September 29, 1925Telephone signaling systemGRAY ERNEST AAMERICAN TELEPHONE & TELEGRAPH
1556320October 6, 1925High-frequency multiplex signaling systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1556319October 6, 1925High-frequency multiplex signaling systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1556318October 6, 1925High-frequency multiplex signaling systemLLOYD ESPENSCHIED ; AFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1556311October 6, 1925Signaling systemDAVIDSON JR JOHNAMERICAN TELEPHONE & TELEGRAPH
1555917October 6, 1925TelegraphyFELL JOHN MAMERICAN TELEPHONE & TELEGRAPH
1555916October 6, 1925Frequency-translating systemLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1555893October 6, 1925Alternating-current relayTHOMPSON ELMER OAMERICAN TELEPHONE & TELEGRAPH
1555875October 6, 1925Telegraph measuring systemPIERCE RALPH EAMERICAN TELEPHONE & TELEGRAPH
1555870October 6, 1925Telegraph repeaterHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1557230October 13, 1925Complementary filterZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1557229October 13, 1925Terminating network for filtersZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1557079October 13, 1925Telephone signaling equipmentMOREHOUSE LYMAN FAMERICAN TELEPHONE & TELEGRAPH
1557037October 13, 1925Reduction of cross talkLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1558280October 20, 1925Secret system of telegraphyPOTTS LOUIS MAMERICAN TELEPHONE & TELEGRAPH
1557633October 20, 1925Translating deviceVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1557596October 20, 1925Machine-switching telephone exchange systemLAMB WILLIS E ; MASON RALPH WAMERICAN TELEPHONE & TELEGRAPH
1557562October 20, 1925Frequency selective deviceGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1557544October 20, 1925Carrier frequency arrangementAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1559159October 27, 1925Telegraph signaling systemCARSON JOHN RAMERICAN TELEPHONE & TELEGRAPH
1558564October 27, 1925Electrical testing systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1558534October 27, 1925Telephone circuitsDAVIDSON JR JOHNAMERICAN TELEPHONE & TELEGRAPH
1558521October 27, 1925Telephone-exchange systemVON NOSTITZ ERICHAMERICAN TELEPHONE & TELEGRAPH
1559659November 3, 1925Service-observing equipment for automatic telephone systemsWALTERS JAMES NAMERICAN TELEPHONE & TELEGRAPH
1559656November 3, 1925Method of and means for increasing voltagesJAY THORP IAMERICAN TELEPHONE & TELEGRAPH
1559642November 3, 1925Signaling with phase reversalsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1559641November 3, 1925Signaling with phase reversalsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1559638November 3, 1925Wave filterMARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1561345November 10, 1925Telephone attachmentMILLER VOLNEY TAMERICAN TELEPHONE ADVERTISING
1560610November 10, 1925Supervisory circuitsSHOFFSTALL HUGH FAMERICAN TELEPHONE AND TELEPHG
1560544November 10, 1925Testing circuits for echo suppressorsGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1560543November 10, 1925Testing circuits for echo suppressorsGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1560540November 10, 1925Means for preventing electrical interferenceCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1560531November 10, 1925Automatic switchBLAUVELT WILLIAM GAMERICAN TELEPHONE & TELEGRAPH
1561532November 17, 1925Telegraph systemCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1561531November 17, 1925Telegraph circuitsCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1561530November 17, 1925Telegraph repeater circuitsCONOVER ELMER JAMERICAN TELEPHONE & TELEGRAPH
1561526November 17, 1925Printing telegraphyVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1561524November 17, 1925Telephone testing systemSANDALLS JR GEORGEAMERICAN TELEPHONE & TELEGRAPH
1562528November 24, 1925Telephone systemTOOMEY JOHN F ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1562527November 24, 1925Telephone-exchange systemTOOMEY JOHN F ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1562526November 24, 1925Telephone-exchange systemTOOMEY JOHN F ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1562500November 24, 1925Receiving circuits for low-frequency impulsesLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1562485November 24, 1925Movement and position indicatorAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1563599December 1, 1925Telephone-exchange systemWALTERS JAMES NAMERICAN TELEPHONE & TELEGRAPH
1563432December 1, 1925Composite ringer for transmission systemsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1563377December 1, 1925Pulling and transposing mechanism for line wiresKLEIN CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1563370December 1, 1925Testing set for telephone systemsEMIL JACOBSENAMERICAN TELEPHONE & TELEGRAPH
1563326December 1, 1925Secret-communication systemRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1564266December 8, 1925Electrical transformerHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1564259December 8, 1925Electrical testing systemMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1564224December 8, 1925Modulating apparatus for telegraph signalsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1564203December 8, 1925Receiver shuntCLARK ALVA B ; GEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1564201December 8, 1925Loading systemCARSON JOHN R ; CLARK ALVA B ; JOHN MILLSAMERICAN TELEPHONE & TELEGRAPH
1565555December 15, 1925Arrangement for automatically controlling volume outputFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1565548December 15, 1925Arrangement for controlling volume rangeCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1565544December 15, 1925Radio transmission systemRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1565540December 15, 1925Automatic volume regulation of transmission systemsWRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1565522December 15, 1925Carrier-current multiplex signaling systemSTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1565521December 15, 1925Secret-communication systemSTONE STONE JOHN ; CUSTER ROSE CLAUDEAMERICAN TELEPHONE & TELEGRAPH
1565491December 15, 1925Volume control of transmissionHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1565441December 15, 1925Automatic volume regulation of transmission systemsHAMILTON HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1565358December 15, 1925Alloy for electrical contactsGARDNER LELAND AAMERICAN TELEPHONE & TELEGRAPH
1565343December 15, 1925Printing-telegraph-exchange systemVERNAM GILBERT S ; PERRY DONALD BAMERICAN TELEPHONE & TELEGRAPH
1565325December 15, 1925Means for regulating motorsJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1566345December 22, 1925Trunk circuitsPETERSON GEORGE HAMERICAN TELEPHONE & TELEGRAPH
1566337December 22, 1925Sound radiatorMARTIN WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1566311December 22, 1925Telephone-repeater circuitsCLARK ALVA B ; HOYT RAY SAMERICAN TELEPHONE & TELEGRAPH
1566295December 22, 1925Printing-telegraph systemWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1567208December 29, 1925Program transmission over wiresTOOMEY JOHN F ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1567204December 29, 1925Radio transmitting systemSTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1567167December 29, 1925Four-wire repeater circuitsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1567128December 29, 1925Wire program-transmission systemFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1568891January 5, 1926Repeater circuitsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1568861January 5, 1926Repeater circuitAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1568145January 5, 1926Frequency filter for electric currentsELSASSER HENRY WAMERICAN TELEPHONE & TELEGRAPH
1568144January 5, 1926Frequency selective circuitsELSASSER HENRY WAMERICAN TELEPHONE & TELEGRAPH
1568143January 5, 1926Frequency selective circuitsELSASSER HENRY WAMERICAN TELEPHONE & TELEGRAPH
1568142January 5, 1926Frequency selective circuitsELSASSER HENRY WAMERICAN TELEPHONE & TELEGRAPH
1568141January 5, 1926Frequency selective circuitsELSASSER HENRY WAMERICAN TELEPHONE & TELEGRAPH
1569055January 12, 1926Telegraph circuitALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1569034January 12, 1926Machine-switching telephone-exchange systemRHODES WILLIAM AAMERICAN TELEPHONE & TELEGRAPH
1569001January 12, 1926Electrical measuring apparatusBENSON CLARK ALVA ; GEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1568996January 12, 1926Electrical measuring apparatusBEST FRED HAMERICAN TELEPHONE & TELEGRAPH
1568991January 12, 1926Ciphering and deciphering deviceMOREHOUSE LYMAN FAMERICAN TELEPHONE & TELEGRAPH
1569936January 19, 1926Machine-switching systemEDMUND LANDAMERICAN TELEPHONE & TELEGRAPH
1569905January 19, 1926Method and apparatus for neutralizing radiointerference on wire linesAFFEL HERMAN A ; ILGENFRITZ LESTER MAMERICAN TELEPHONE & TELEGRAPH
1569898January 19, 1926Signaling systemTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1569874January 19, 1926Indicating means for calling dialsNEWBY NEAL DAMERICAN TELEPHONE & TELEGRAPH
1570772January 26, 1926Reduction of distortion in multiplex repeatersHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1570771January 26, 1926Means for and method of reducing interferenceHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1570770January 26, 1926Means for and method of reducing interferenceHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1570755January 26, 1926Radio ringing systemLOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1570741January 26, 1926Testing system for machine-switching circuitsHARDEN WILLIAM H ; GRAEFENECKER MICHAEL AAMERICAN TELEPHONE & TELEGRAPH
1571513February 2, 1926Telephone substation circuitsEDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1572785February 9, 1926Telegraph circuitFOX FRANCIS HAMERICAN TELEPHONE & TELEGRAPH
1572757February 9, 1926Multiplex signaling systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1572010February 9, 1926Detector circuitJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1571991February 9, 1926Telephone ringing systemBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1573282February 16, 1926Thermionic modulatorSTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1573068February 16, 1926Voltage-limiting deviceHONAMAN RICHARD KAMERICAN TELEPHONE & TELEGRAPH
1572992February 16, 1926Adjustable electrical networkGEORGE CRISSON ; GLEZEN LEE LAMERICAN TELEPHONE & TELEGRAPH
1572977February 16, 1926Telephone systemVON NOSTITZ ERICHAMERICAN TELEPHONE & TELEGRAPH
1573907February 23, 1926Telephone-exchange systemBLAUVELT WILLIAM GAMERICAN TELEPHONE & TELEGRAPH
1573891February 23, 1926Gain-controlling circuitsWRIGHT SUMNER B ; SCHOTT JOHN TAMERICAN TELEPHONE & TELEGRAPH
1573801February 23, 1926Trouble-alarm system for radio receiving setsRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1573794February 23, 1926Telephone-exchange systemBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1574808March 2, 1926Regulation of transmissionGANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1574807March 2, 1926Means for regulating voltagesGANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1574781March 2, 1926Voice-operated repeater systemBARTON HENRY AAMERICAN TELEPHONE & TELEGRAPH
1574780March 2, 1926Means for and method of modulationAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1574779March 2, 1926Translating circuitsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1575672March 9, 1926Wire carrier program-distribution systemBLACKWELL OTTO BAMERICAN TELEPHONE & TELEGRAPH
1575659March 9, 1926Filter arrangement for wire program-distribution circuitsSTRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1575658March 9, 1926Volume control for program-distribution systemsSTRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1575650March 9, 1926Telegraph keySHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1575628March 9, 1926Telegraph signaling systemJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1576658March 16, 1926Telephone-exchange systemJACOBSEN EMILAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1576657March 16, 1926Telephone-exchange systemEMIL JACOBSENAMERICAN TELEPHONE & TELEGRAPH
1576579March 16, 1926Ground-potential-neutralizing systemCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1576566March 16, 1926Duplex balancing arrangementAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1576561March 16, 1926Arrangement for exercising remote control over repeatersTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1577720March 23, 1926Acoustic shock absorber for telephone linesHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1577719March 23, 1926Electrical protective deviceHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1577515March 23, 1926Selective signaling circuits for carrier systemsBONELL RALPH KAMERICAN TELEPHONE & TELEGRAPH
1577514March 23, 1926Selector circuitsBONELL RALPH KAMERICAN TELEPHONE & TELEGRAPH
1577513March 23, 1926Telephone-exchange systemBLAUVELT WILLIAM GAMERICAN TELEPHONE & TELEGRAPH
1578307March 30, 1926Inductance coilZINN MANVEL KAMERICAN TELEPHONE & TELEGRAPH
1578299March 30, 1926Printing-telegraph systemVERNAM GILBERT S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1578269March 30, 1926Signaling arrangement for four-wire circuitsDEMAREST CHARLES SAMERICAN TELEPHONE & TELEGRAPH
1579307April 6, 1926Tool handleGORDON CHESTER SAMERICAN TELEPHONE & TELEGRAPH
1579283April 6, 1926Multiple-way connection for alpha plurality of linesGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1579263April 6, 1926Electrical transmission of picturesWATSON EDWARD F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1580624April 13, 1926Gain-control circuits for repeatersHARRY NYQUIST ; BOUTON LEWIS L ; SHOFFSTALL HUGH FAMERICAN TELEPHONE & TELEGRAPH
1580225April 13, 1926Telegraph circuitWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1580192April 13, 1926Duplex telegraph systemFELL JOHN MAMERICAN TELEPHONE & TELEGRAPH
1580191April 13, 1926Means for reducing cross fire in telegraph circuitsFELL JOHN MAMERICAN TELEPHONE & TELEGRAPH
1581326April 20, 1926Means for preventing bias in telegraph systemsSHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1581314April 20, 1926Device for coiling cablesHERBERT CLIFFORD MAMERICAN TELEPHONE & TELEGRAPH
1581305April 20, 1926Electrical controlling systemWATSON EDWARD F ; HUNT ARTHUR EAMERICAN TELEPHONE & TELEGRAPH
1582113April 27, 1926Phantom carrier circuitsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1582112April 27, 1926Phantom carrier circuitsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1582073April 27, 1926Phantom carrier circuitsO'LEARY JOSEPH TAMERICAN TELEPHONE & TELEGRAPH
1583004May 4, 1926Signal-detecting systemOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1582984May 4, 1926Automatic regulation of echo-suppressor sensitivityHAMILTON HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1582948May 4, 1926Testing systemWALTERS JAMES N ; CLAUDE EWINGAMERICAN TELEPHONE & TELEGRAPH
1583854May 11, 1926Volume-control apparatusPERRY DONALD BAMERICAN TELEPHONE & TELEGRAPH
1583827May 11, 1926Loading transmission linesGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1583826May 11, 1926Method and apparatus for balancing out radiointerference on wire linesDEARDORFF RALPH WAMERICAN TELEPHONE & TELEGRAPH
1584819May 18, 1926WinchSMITH TEMPLE C ; FREEMAN ALBERT E ; SIMONDS GEORGE DAMERICAN TELEPHONE & TELEGRAPH
1584749May 18, 1926Ciphering deviceVERNAM GILBERT S ; PERRY DONALD BAMERICAN TELEPHONE & TELEGRAPH
1584748May 18, 1926Circuit controllerTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1585729May 25, 1926Emergency switching mechanismMATTE ANDREW LAMERICAN TELEPHONE & TELEGRAPH
1585702May 25, 1926Echo suppressor for two-wire systemsCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1585701May 25, 1926Method and means for telephone transmission measurementsCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1587363June 1, 1926Attenuation-controlling deviceBLACKWELL OTTO BAMERICAN TELEPHONE & TELEGRAPH
1586633June 1, 1926Drainage method for four-wire-cable systemsMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1586587June 1, 1926Testing system for testing subscribers' station apparatusTAPLIN CARLETON VAMERICAN TELEPHONE & TELEGRAPH
1587620June 8, 1926Telephone-exchange systemTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1587610June 8, 1926Telephone-exchange systemSMITH ROY HAMERICAN TELEPHONE & TELEGRAPH
1587574June 8, 1926Doubly-periodic wave filterZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1588566June 15, 1926Step for polesEINAR WISMERAMERICAN TELEPHONE & TELEGRAPH
1588450June 15, 1926Telegraph systemCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1588437June 15, 1926Telephone systemBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1589406June 22, 1926Ringing arrangement for carrier circuitsLOYNES OWEN H ; OHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1589405June 22, 1926Ringing arrangement for carrier circuitsLOYNES OWEN H ; OHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1589395June 22, 1926Telephone repeaterJACOBS OLIVER BAMERICAN TELEPHONE & TELEGRAPH
1590270June 29, 1926Method and apparatus for synchronizing in picture-transmission systemsWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1590263June 29, 1926AmplifierSTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1590252June 29, 1926Artificial lineOSBORNE HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1591108July 6, 1926Program transmission over wiresTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1591107July 6, 1926Program transmission over wiresTOOMEY JOHN F ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1591073July 6, 1926Electrical networkZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1591998July 13, 1926Dial-operating devicePOPPER JULIUS SAMERICAN TELEPHONE & TELEGRAPH
1591994July 13, 1926Electrical measuring apparatusHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1591961July 13, 1926Grid circuit for electron tubesCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1592901July 20, 1926OscillatorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1592885July 20, 1926Broadcast transmission systemFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1592883July 20, 1926Repeater for transmission linesBARTON HENRY A ; HARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1593640July 27, 1926Neutralization of inductive interferenceTRUEBLOOD HOWARD MAMERICAN TELEPHONE & TELEGRAPH
1593639July 27, 1926Optical systemREYNOLDS FREDERICK WAMERICAN TELEPHONE & TELEGRAPH
1593619July 27, 1926Carrier signaling systemALLEN CARPEAMERICAN TELEPHONE & TELEGRAPH
1594454August 3, 1926Transmission circuitsCLARK ALVA B ; GEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1594453August 3, 1926Transmission circuitsCLARK ALVA B ; GEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1594432August 3, 1926Telephone systemTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1595159August 10, 1926Telephone repeater systemJACOBS OLIVER BAMERICAN TELEPHONE & TELEGRAPH
1595142August 10, 1926Means for preventing bias in telegraph systemsCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1595135August 10, 1926Carrier-current signal systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1596102August 17, 1926High-frequency translating circuitsHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1596101August 17, 1926High-frequency signaling systemHOLDEN WILLIAM H T ; WILLIAM SCHRAMM FREDAMERICAN TELEPHONE & TELEGRAPH
1596087August 17, 1926Selecting circuitsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1596942August 24, 1926Measuring transmission phase shiftHARRY NYQUIST ; ETHERIDGE JR HARRY AAMERICAN TELEPHONE & TELEGRAPH
1596941August 24, 1926Measuring transmission delayHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1596916August 24, 1926Measuring transmission delayWRIGHT SUMNER B ; PFLEGER KENNETH WAMERICAN TELEPHONE & TELEGRAPH
1597817August 31, 1926Multiplex signaling systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1597790August 31, 1926Multiplex signaling systemJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1597789August 31, 1926Telegraph-distortion-measuring machineJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1598694September 7, 1926Electrical regulatorSHACKLETON SAMUEL PAMERICAN TELEPHONE & TELEGRAPH
1598673September 7, 1926Secrecy communication systemBLACKWELL OTTO B ; MARTIN DE LOSS K ; VERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1598663September 7, 1926Multiplex radio telegraphy and telephonySTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1599499September 14, 1926Battery lightST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1599453September 14, 1926Antenna structureAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1599445September 14, 1926Alternating-current printing-telegraph systemWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1600290September 21, 1926Wave filterMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1600283September 21, 1926Artificial lineHITCHCOCK HARRY WAMERICAN TELEPHONE & TELEGRAPH
1600274September 21, 1926Telephone-transmission circuitsGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1601037September 28, 1926Artificial lineHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1601023September 28, 1926Electrical signaling systemHOYT RAY SAMERICAN TELEPHONE & TELEGRAPH
1601021September 28, 1926Superimposed ringing systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1601808October 5, 1926Multiplex signaling systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1601796October 5, 1926Nail expansion anchorGORDON GEORGE BAMERICAN TELEPHONE & TELEGRAPH
1602469October 12, 1926Electrical transmission of picturesWATSON EDWARD F ; ALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1603329October 19, 1926Tapered filter for alternating currents of varying frequencyEGINHARD DIETZEAMERICAN TELEPHONE & TELEGRAPH
1603319October 19, 1926Telephone repeaterCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1603305October 19, 1926Electrical network and method of transmitting electric currentsZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1604282October 26, 1926Submarine cableHAISLIP RICHARD AAMERICAN TELEPHONE & TELEGRAPH
1604163October 26, 1926Means for regulating motorsJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1604140October 26, 1926Multifrequency oscillatorAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1605469November 2, 1926Long-distance cableOTTO SATTELBERGAMERICAN TELEPHONE & TELEGRAPH
1605010November 2, 1926Signaling systemSTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1605001November 2, 1926Vacuum valve with glow dischargeFRITZ SCHROTERAMERICAN TELEPHONE & TELEGRAPH
1604981November 2, 1926Selective circuitELSASSER HENRY W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1605933November 9, 1926Duplex telegraph systemGANNETT DANFORTH K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1606855November 16, 1926Distortion-measuring systemWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1607837November 23, 1926Radio repeater systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1607687November 23, 1926Electrical circuitsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1607683November 23, 1926Radio repeater systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1607682November 23, 1926Radio repeater systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1607673November 23, 1926Telephone-substation circuitsINGLIS ALFRED HAMERICAN TELEPHONE & TELEGRAPH
1607668November 23, 1926Carrier transmission over power circuitsFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1608566November 30, 1926System for binaural transmission of soundPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1608551November 30, 1926Radio signaling systemDEMAREST CHARLES S ; BONELL RALPH KAMERICAN TELEPHONE & TELEGRAPH
1608546November 30, 1926Distortion-measuring systemCLARK ALVA B ; SHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1609394December 7, 1926Telephone systemBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1611124December 14, 1926System of transmission over loaded linesHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1610234December 14, 1926Carrier-signaling systemALMQUIST MILTON LAMERICAN TELEPHONE & TELEGRAPH
1611252December 21, 1926Switching systemSNAVELY PAUL MAMERICAN TELEPHONE & TELEGRAPH
1611224December 21, 1926Method and apparatus for measuring frequencyHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1611223December 21, 1926Apparatus for controlling the frequency of an alternating currentHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1612019December 28, 1926Asymmetrical wave-generating systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1612011December 28, 1926Recording and reproducing systemGREEN IRVING W ; BISBEE FREDERICK CAMERICAN TELEPHONE & TELEGRAPH
1612005December 28, 1926Electrical picture-transmission systemELLSWORTH JAMES DAMERICAN TELEPHONE & TELEGRAPH
1612849January 4, 1927Testing deviceANDERSON GRENVILLE T. ; TAPLIN CARLETON V.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1612848January 4, 1927Multiplex telegraphyAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1613704January 11, 1927Telegraph-distortion measuring systemHERMAN JOSEPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1613686January 11, 1927Method of and apparatus for secret electrical transmission of picturesVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1613685January 11, 1927Printing-telegraph exchange systemVERNAM GILBERT S. ; PERRY DONALD B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1614555January 18, 1927Multiplex telegraph system with magnitude discriminationHUNTER HOWARD V.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1614546January 18, 1927Multiplex telegraphy with magnitude discriminationDEARDORFF RALPH W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1614545January 18, 1927Carrier telegraph circuitsDEARDORFF RALPH W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1615259January 25, 1927Telephone repeater systemCLARK ALVA B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1615252January 25, 1927Electrical wave filterZOBEL OTTO J.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1615219January 25, 1927Telephone switchboard cord terminal test connecterFRANFIELD JOHN C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1615913February 1, 1927Radio direction-finding systemOSBORNE HAROLD S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1615911February 1, 1927Apparatus and method for regulating attenuation and phase on transmission linesNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1615896February 1, 1927High-frequency signaling systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1616892February 8, 1927Duplex radio systemESPENSCHIED LLOYD ; MARTIN DE LOSS K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1616507February 8, 1927Means for measuring the margin of operation of telegraph circuitsPIERCE RALPH E.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1616499February 8, 1927Linear measuring deviceJR. MARK KING,AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1616491February 8, 1927Headband for telephone receiversGREEN IRVING W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1617935February 15, 1927Multiplex telegraphy by phase discriminationAFFEL HERMAN A. ; DEARDORFF RALPH W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1617934February 15, 1927Carrier telegraph systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1617482February 15, 1927Intermediate telegraph set for duplex linesHERMAN JOSEPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1617467February 15, 1927Radio signalling systemUPHOFF LESLIE S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1618242February 22, 1927Time-announcing systemTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1618201February 22, 1927Substation circuitsINGLIS ALFRED H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1618193February 22, 1927Telegraph systemHERMAN JOSEPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1619085March 1, 1927Carrier-current signaling systemNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1619060March 1, 1927System of multifrequency circuitsDEARDORFF RALPH W.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1619058March 1, 1927Telephone repeater stationCRISSON GEORGEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1620012March 8, 1927Telephone-exchange systemDUNHAM BERT G. ; HAINES WILLIAM T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
WESTERN ELECTRIC COMPANY, INCORPORATED
1619897March 8, 1927Printing-telegraph-exchange systemVERNAM GILBERT S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1619891March 8, 1927Echo-suppressor relaySILENT HAROLD C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1619882March 8, 1927Means for transferring high-frequency energyOHL RUSSILL S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1621480March 15, 1927Testing systemEWING CLAUDEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1620733March 15, 1927Telephone systemNELSON STANLEY F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1621557March 22, 1927Combined resonant shunt device for telegraph circuitsNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1621533March 22, 1927Alternating-current relayGRIMES DAVIDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1621530March 22, 1927Dead-ending clampFITZPATRICK PAUL G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1622370March 29, 1927Multiple-antenna system for radiocommunicationESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1622357March 29, 1927Electrical transmitting systemSTAPLES ELLIOT M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1622297March 29, 1927Radio printing-telegraph systemVERNAM GILBERT S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1623139April 5, 1927Telephone-exchange systemTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1623118April 5, 1927Telephone-exchange systemJACOBSEN EMILAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1623095April 5, 1927Multiway connectionCRISSON GEORGE ; SILENT HAROLD C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1624057April 12, 1927Telephone substation circuitsMCKOWN FREDERICK W. ; DIETZE EGINHARDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1624056April 12, 1927Telephone substation circuitsMCKOWN FREDERICK W. ; DIETZE EGINHARDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1624023April 12, 1927Equalization of transmissionSTRIEBY MAURICE E. ; FETTER CHARLES H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1624936April 19, 1927Telegraph systemFARIES CHARLES LEEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1625897April 26, 1927Cable clamp and bridle ringKLEIN CHARLES H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1625823April 26, 1927Radio receiver and trouble alarmPOTTER RALPH K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1625822April 26, 1927Radio receiver and trouble alarmPOTTER RALPH K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1627111May 3, 1927Picture-transmitting systemNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1626743May 3, 1927Cone loud-speaker diaphragmMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1626731May 3, 1927Method of and apparatus for synchronization in picture transmissionHERMAN JOSEPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1626724May 3, 1927Frequency-controlling systemDEMAREST CHARLES S. ; ALMQUIST MILTON L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1628392May 10, 1927Telegraph distortion measuring systemCORY SAMUEL I.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1627701May 10, 1927System for transmitting and reproducing picturesHALL MERTON C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1627633May 10, 1927Telegraph distortion-measuring systemCORY SAMUEL I.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1628883May 17, 1927Carrier amplitude-control systemHOLDEN WILLIAM H. T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1628697May 17, 1927Program transmission over wiresTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1629491May 24, 1927Program-selecting circuitsFETTER CHARLES H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1630340May 31, 1927Telegraph systemHALL MERTON C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1630312May 31, 1927Thermal translating deviceRHODES WILLIAM A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1630293May 31, 1927Step for polesFISH LEWIN B.AMERICAN TELEPHONE & TELEGRAPH COMPANY
1631174June 7, 1927Telegraph signaling systemWILBURN SIDNEY D.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1631153June 7, 1927Trunk circuitsPETERSON GEORGE H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1631143June 7, 1927Deflection dynamometerMATTHEWS EDGAR M. ; CARR JAMES A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1632030June 14, 1927Method and means for the identification of electrical cablesMARTIN WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1632025June 14, 1927Automatic telephone systemDUSTIN GEORGE E.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1632012June 14, 1927Program-selecting circuitsTOOMEY JOHN F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1633082June 21, 1927Distribution of intelligenceLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1632826June 21, 1927Trunk signaling systemEAGON LLOYD L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1632817June 21, 1927Transmission systemBASCOM HENRY M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1632814June 21, 1927Filter for periodic electric currentsZINN MANVEL K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1632777June 21, 1927Distribution of intelligenceAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1633625June 28, 1927Secrecy systemRSPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1633615June 28, 1927Delay circuits for voice-operated devicesSILENT HAROLD C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1633611June 28, 1927Means for preventing electrical interfer enceSHANCK ROY B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1634734July 5, 1927Telephone-exchange systemBLAUVELT WILLIAM G.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1634299July 5, 1927Telegraph circuitsPARKER RALZEMOND D.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1634286July 5, 1927Telegraph circuitsHERMAN JOSEPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1634271July 5, 1927Composite ringerSHACKLETON SAMUEL P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1635227July 12, 1927Cord-circuit repeaterSHACKLETON SAMUEL P. ; GLEZEN LEE L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1635209July 12, 1927Telegraph distortion-measuring systemFELL JOHN M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1635207July 12, 1927Carrier current telegraphyESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1636054July 19, 1927Electrical discharge deviceHOLDEN WILLIAM H. T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1636053July 19, 1927Carrier-telegraph repeater circuitsHAMILTON BAXTER P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1636031July 19, 1927Voice-operated relay equipmentWRIGHT SUMNER B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1637324July 26, 1927Printing-telegraph-exchange systemPERRY DONALD B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1636737July 26, 1927Electrical wave filterDIETZE EGINHARDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1636713July 26, 1927Electrical wave filterREIER GEORGE C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1637419August 2, 1927Nail-expansion anchorKLEIN HARLES HAMERICAN TELEPHONE & TELEGRAPH
1637404August 2, 1927Signaling systemBOWN RALPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1637403August 2, 1927Telephone systemABBOTT HENRY H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1638437August 9, 1927Electrical networkGANNETT DANFORTH K. ; KIRKWOOD MACLEANAMERICAN TELEPHONE AND TELEGRPAH COMPANY
1638432August 9, 1927Strand tightenerCONNORS NEILSON D.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1638430August 9, 1927Straightforward trunking systemBAILEY RAND S. ; BROE EDGAR P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1639135August 16, 1927Telephone systemJOHNSON HERBERT B. ; EAGON LLOYD LA FAYETTEBELL TELEPHONE LABORATORIES, INCORPORATED
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1638952August 16, 1927Means for regulating transmission circuitsNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1638930August 16, 1927Voltage regulator for vacuum tubesHERMAN JOSEPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1638925August 16, 1927High-frequency signaling systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1639819August 23, 1927Cleaning device for dials of telephone instrumentsTHOMPSON GEORGE K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1639799August 23, 1927Automatic telephone systemFRIEND OTTO A. ; DUSTIN GEORGE E.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1640435August 30, 1927Sighting instrument for measuring anglesARMSTRONG FRANK C.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1640425August 30, 1927Measuring instrumentPERCIVAL HARRY S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1641290September 6, 1927Printing-telegraph-exchange systemPERRY DONALD B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1641289September 6, 1927Radio signaling systemOHL RUSSELL S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1641218September 6, 1927Straightforward trunking systemBAILEY RAND S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1642048September 13, 1927Printing telegraph systemVERNAM GILBERT S. ; PERRY DONALD B.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1642040September 13, 1927Public-address systemMCCUTCHEN BRUNSON SAMERICAN TELEPHONE & TELEGRAPH
1642025September 13, 1927Cross-armHOSFORD ROGER F.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1642710September 20, 1927Pilot-channel-indicating systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1642703September 20, 1927Carrier telegraph receiverTHORP VAUGHN P.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1643350September 27, 1927Neutralization of inductive interferenceSHETZLINE ROY A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1643332September 27, 1927Electrical networkCAMPBELL GEORGE A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1643323September 27, 1927Directive antenna arraySTONE JOHN STONEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1644024October 4, 1927Lighting circuitMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1644014October 4, 1927Carbon-monoxide detectorGORDON CHESTER S. ; LOWE JAMES T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1644004October 4, 1927Electrical wave filterZOBEL OTTO J.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1644745October 11, 1927Transmission-level-control systemPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1644727October 11, 1927By-pass selector circuitEMIL JACOBSENAMERICAN TELEPHONE & TELEGRAPH
1645618October 18, 1927Method and apparatus for measuring transmission delayHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1645607October 18, 1927System of synchronizing signaling apparatusMATTE ANDREW LAMERICAN TELEPHONE & TELEGRAPH
1645573October 18, 1927Telephone-exchange systemBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1646444October 25, 1927Protection circuitsALLEN CARPE ; DEARDORFF RALPH WAMERICAN TELEPHONE & TELEGRAPH
1646439October 25, 1927Harmonic generatorAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1646438October 25, 1927Harmonic generatorAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1647796November 1, 1927Telephone systemGLEZEN LEE L ; SHACKLETON SAMUEL P ; EDWARD VROOMWESTERN ELECTRIC CO
AMERICAN TELEPHONE & TELEGRAPH
1647212November 1, 1927Vacuum-tube-echo suppressorGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1647192November 1, 1927Apparatus for controlling the frequency of an alternating currentHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1648145November 8, 1927Method and apparatus for compensating distortion on long loaded linesHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1648079November 8, 1927Testing system for telephone cord circuitsTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1648058November 8, 1927ElectrovisionPARKER RALZEMOND DAMERICAN TELEPHONE & TELEGRAPH
1648975November 15, 1927Printing-telegraph-exchange systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1648974November 15, 1927Printing-telegraph-exchange systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1648922November 15, 1927Printing-telegraph systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1649884November 22, 1927Protective circuitsWRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1649863November 22, 1927Cross-fire-neutralizing systemSHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1649819November 22, 1927System of televisionFELL JOHN MAMERICAN TELEPHONE & TELEGRAPH
1650865November 29, 1927Headband for telephone receiversEDWARDS WILLIAM H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1650683November 29, 1927Straightforward trunking systemBASCOM HENRY M ; FOWLER CLARENCE BAMERICAN TELEPHONE & TELEGRAPH
BELL TELEPHONE LABOR INC
1650671November 29, 1927Stereopticon-control deviceVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1650655November 29, 1927System of multifrequency circuitsROSE ARTHUR FAMERICAN TELEPHONE & TELEGRAPH
1651480December 6, 1927Battery lightST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1651451December 6, 1927Battery lightFISH LEWIN BAMERICAN TELEPHONE & TELEGRAPH
1651440December 6, 1927Electrical testing apparatusCAMPBELL GEORGE AAMERICAN TELEPHONE & TELEGRAPH
1652242December 13, 1927Telegraph repeaterJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1652241December 13, 1927Device for electrical measurementHALL MERTON CAMERICAN TELEPHONE & TELEGRAPH
1652239December 13, 1927Coin collectorEDWARDS WILLIAM H ; TUCKER REXFORD SAMERICAN TELEPHONE & TELEGRAPH
1653089December 20, 1927Telegraph systemDEMAREST CHARLES SAMERICAN TELEPHONE & TELEGRAPH
1653082December 20, 1927Volume indicatorAUSTIN BAILEYAMERICAN TELEPHONE & TELEGRAPH
1653074December 20, 1927Transmission of pictures by electricityALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1653738December 27, 1927Suppression of echoes and singing in four-wire circuitsSILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1653736December 27, 1927Impulse-registering deviceSHACKLETON SAMUEL P ; SCHOTT JOHN TAMERICAN TELEPHONE & TELEGRAPH
1653694December 27, 1927Apparatus and method for measuring transmitted lightBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1654657January 3, 1928Cable terminalMATTHEWS EDGAR MAMERICAN TELEPHONE & TELEGRAPH
1654645January 3, 1928Recording systemWALTER GREEN IRVINGAMERICAN TELEPHONE & TELEGRAPH
1654633January 3, 1928Recording systemCARLETON BISBEE FREDERICKAMERICAN TELEPHONE & TELEGRAPH
1655448January 10, 1928Printing telegraph systemWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1655420January 10, 1928Intermediate telegraph stationJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1656250January 17, 1928Alternating-current relayTHOMPSON ELMER O ; DAVID GRIMES ; FISHER HENRY CAMERICAN TELEPHONE & TELEGRAPH
1656226January 17, 1928Wire clampPALM SAMUEL M ; PUTNAM HOWARD PAMERICAN TELEPHONE & TELEGRAPH
1656987January 24, 1928Ultrahigh-frequency generatorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1656957January 24, 1928Glow-discharge valveFRITZ SCHROTERAMERICAN TELEPHONE & TELEGRAPH
1656956January 24, 1928Electric vacuum valve tubbFRITZ SCHROTERAMERICAN TELEPHONE & TELEGRAPH
1657498January 31, 1928Radio signaling systemDEMAREST CHARLES S ; ALMQUIST MILTON LAMERICAN TELEPHONE & TELEGRAPH
1657462January 31, 1928Nonsinging reamplifying circuitsLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1657451January 31, 1928Nonsinging reamplifying circuitsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1658096February 7, 1928Unloading device for belt conveyersPASCHEN HAROLD FAMERICAN TELEPHONE & TELEGRAPH
1658095February 7, 1928Feeding device for belt conveyersPASCHEN HAROLD FAMERICAN TELEPHONE & TELEGRAPH
1658094February 7, 1928Paper-conveying systemPASCHEN HAROLD F ; DE POTTER EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1658887February 14, 1928Duct grappleDOTZAUER JOHN FAMERICAN TELEPHONE & TELEGRAPH
1658856February 14, 1928Transmission-line control systemPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1658851February 14, 1928Directive radio repeating systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1659745February 21, 1928Wire clampRAPELJE JOHN AAMERICAN TELEPHONE & TELEGRAPH
1659731February 21, 1928InsulatorGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1659729February 21, 1928Constant-voltage alternatorGANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1660405February 28, 1928High-frequency-measuring systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1660389February 28, 1928System of synchronizing signaling apparatusMATTE ANDREW L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1660388February 28, 1928System of synchronizing signaling apparatusMATTE ANDREW L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1661264March 6, 1928Method of and means for regulating the transmission over electric circuitsNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1661263March 6, 1928Method of and means for regulating the transmission over electric circuitsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1661167March 6, 1928System of picture transmissionCLARK ALVA B ; GANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1662126March 13, 1928Duplex radio signaling setPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1662081March 13, 1928High-frequency modulating systemSILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1662060March 13, 1928Relay and circuits thereforJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1662888March 20, 1928Automatic volume control for telephone linesJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1663750March 27, 1928Automatic transmission-measuring setBEST FRED HAMERICAN TELEPHONE & TELEGRAPH
1663748March 27, 1928Braid stripper for insulated wiresBENDER HUGH D ; JOHN KENT ROBERTAMERICAN TELEPHONE & TELEGRAPH
1663747March 27, 1928Telephone-exchange systemBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1664652April 3, 1928Picture-transmitting systemWATSON EDWARD F ; ALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1664468April 3, 1928Program-selecting circuitsSTRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1664455April 3, 1928Electrical translating circuitKING ROBERT WAMERICAN TELEPHONE & TELEGRAPH
1664453April 3, 1928Manual morse multiplex systemJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1665297April 10, 1928Grounded duplex telegraph systemCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1665296April 10, 1928Grounded duplex telegraph systemCORY SAMUEL IAMERICAN TELEPHONE & TELEGRAPH
1665283April 10, 1928Signaling systemSINGER FRED JAMERICAN TELEPHONE & TELEGRAPH
1666158April 17, 1928System for binaural transmission of signalsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1666154April 17, 1928Distribution of programs over wiresTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1666153April 17, 1928Program-selecting circuitsTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1666988April 24, 1928Trunking systemBLAUVELT WILLIAM GAMERICAN TELEPHONE & TELEGRAPH
1666965April 24, 1928Differential duplex telegraph repeaterJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1667824May 1, 1928Multiple-unit cableRICHEY ARCHIE LAMERICAN TELEPHONE & TELEGRAPH
1667792May 1, 1928Radio signaling systemMARTIN DE LOSS K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1667753May 1, 1928Program-selecting circuitsTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1669123May 8, 1928Directive radio repeating systemLLOYD ESPENSCHIED ; MARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1668674May 8, 1928Directive radio repeating systemLLOYD ESPENSCHIED ; MARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1668638May 8, 1928Directive radio repeating systemLLOYD ESPENSCHIED ; MARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1668637May 8, 1928Directive radio repeating systemLLOYD ESPENSCHIED ; MARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1669450May 15, 1928Synchronization in multiplex signalingSMART BRANDAMERICAN TELEPHONE & TELEGRAPH
1669449May 15, 1928Multiplex signaling systemSMART BRANDAMERICAN TELEPHONE & TELEGRAPH
1669448May 15, 1928Multiplex signaling systemSMART BRANDAMERICAN TELEPHONE & TELEGRAPH
1670376May 22, 1928High-speed signaling systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1670375May 22, 1928Picture-transmitting systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1671172May 29, 1928Volume-control apparatusVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1671151May 29, 1928Method of and apparatus for reducing width of transmission bandsFRENCH NORMAN R ; ZINN MANVEL KAMERICAN TELEPHONE & TELEGRAPH
1671143May 29, 1928Wave translatorCAMPBELL GEORGE AAMERICAN TELEPHONE & TELEGRAPH
1671130May 29, 1928Grid circuits of electron tubesSHACKLETON SAMUEL PAMERICAN TELEPHONE & TELEGRAPH
1672057June 5, 1928Electrical circuitsBENSON CLARK ALVAAMERICAN TELEPHONE & TELEGRAPH
1672056June 5, 1928Translating circuitCARSON JOHN RAMERICAN TELEPHONE & TELEGRAPH
1672049June 5, 1928Alternating-current relayALMQUIST MILTON LAMERICAN TELEPHONE & TELEGRAPH
1672940June 12, 1928Carrier transmission over power circuitsHONAMAN RICHARD KAMERICAN TELEPHONE & TELEGRAPH
1672933June 12, 1928Lineman's test setEDWARDS WILLIAM H ; NILES ELIOT WAMERICAN TELEPHONE & TELEGRAPH
1673830June 19, 1928Trouble alarm for telegraph systemsMACLEAN KIRKWOODAMERICAN TELEPHONE & TELEGRAPH
1673829June 19, 1928Testing of telegraph circuitsMACLEAN KIRKWOODAMERICAN TELEPHONE & TELEGRAPH
1673792June 19, 1928Level control for carrier-transmission systemsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1674709June 26, 1928Reeling deviceGRADY THOMAS WILLIAMAMERICAN TELEPHONE & TELEGRAPH
1674696June 26, 1928Radio receiving systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1674695June 26, 1928Radio telephone systemHARRY NYQUIST ; WRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1674679June 26, 1928Voice-operated echo suppressorBLACKWELL OTTO BAMERICAN TELEPHONE & TELEGRAPH
1674677June 26, 1928Connecter-switch circuitBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1675460July 3, 1928Distortion compensatorHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1675441July 3, 1928Means for measuring balance of electrical networksWRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1675429July 3, 1928Reeling deviceSCHNEE HENRY EAMERICAN TELEPHONE & TELEGRAPH
1675423July 3, 1928Telephone substation circuitsOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1675412July 3, 1928Echo and singing suppressor systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1676321July 10, 1928Secrecy signaling systemALLEN CARPEAMERICAN TELEPHONE & TELEGRAPH
1676301July 10, 1928Program-transmission system for apartment housesTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1676252July 10, 1928Multiple-channel radioreceiverCOXHEAD HARRY BAMERICAN TELEPHONE & TELEGRAPH
1676244July 10, 1928Multiple-channel radioreceiverBLACKWELL OTTO B ; MARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1676240July 10, 1928Radio signaling systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1677224July 17, 1928Carrier-receiving systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1677193July 17, 1928Short-circuiting switchMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1677191July 17, 1928Modulating arrangementLOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1677190July 17, 1928Modulating arrangementLOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1677157July 17, 1928System for measuring contact reboundingALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1677983July 24, 1928Printing-telegraph exchange systemPARKER RAIZEMOND D ; PERRY DONALD BAMERICAN TELEPHONE & TELEGRAPH
1677967July 24, 1928Radio signaling systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1677966July 24, 1928Carrier signaling systemGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1677957July 24, 1928Telephone systemEAGON LLOYD LAMERICAN TELEPHONE & TELEGRAPH
1677956July 24, 1928Broadside antenna arrayDEAN SAMUEL WAMERICAN TELEPHONE & TELEGRAPH
1678872July 31, 1928Method and apparatus for producing musical soundsPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1678685July 31, 1928Telephone signal systemTOOMEY JOHN FAMERICAN TELEPHONE & TELEGRAPH
1678674July 31, 1928Method and apparatus for computationKOENIG JR WALTERAMERICAN TELEPHONE & TELEGRAPH
1678672July 31, 1928Two-way radio telephone systemLLOYD ESPENSCHIED ; ANDERSON CLIFFORD NAMERICAN TELEPHONE & TELEGRAPH
1678665July 31, 1928High-frequency measuring systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1678663July 31, 1928InsulatorWILSON LEON TAMERICAN TELEPHONE & TELEGRAPH
1679434August 7, 1928Electric wave filter for variable-load circuitsMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1679427August 7, 1928Underground conduitJEWELL HOWARD WAMERICAN TELEPHONE & TELEGRAPH
1679412August 7, 1928Unloading device for conveying systemsDE POTTER EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1679411August 7, 1928Loading device for conveying systemsDE POTTER EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1679396August 7, 1928Measuring systemBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1680390August 14, 1928Picture-transmitting systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1680377August 14, 1928Alternating potential generatorHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1680376August 14, 1928Telegraph circuitsJOSEPH HERMAN ; SINGER FRED JAMERICAN TELEPHONE & TELEGRAPH
1680367August 14, 1928Repeater circuitsDEMAREST CHARLES SAMERICAN TELEPHONE & TELEGRAPH
1680363August 14, 1928Directive antennaRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1681252August 21, 1928Distortion correction for transmission linesHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1681246August 21, 1928Telephone system with auxiliary signaling circuitMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1681221August 21, 1928Telephone-exchange systemCOGGINS PAUL PAMERICAN TELEPHONE & TELEGRAPH
1681216August 21, 1928Composite setBRANSON DAVID E ; SHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1681972August 28, 1928Carrier amplitude-control systemBLACKWELL OTTO B ; AFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1683739September 11, 1928Directive antenna arraySTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1683725September 11, 1928Phase-regulating systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1683716September 11, 1928Antenna for radiotelegraphyLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1684455September 18, 1928Multiplex carrier-current signalingHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1684445September 18, 1928Signaling systemHONAMAN RICHARD KAMERICAN TELEPHONE & TELEGRAPH
1685161September 25, 1928Multiwinding discharge balance coilHONAMAN RICHARD KAMERICAN TELEPHONE & TELEGRAPH
1685154September 25, 1928LockEDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1685145September 25, 1928HookHERMAN BARTENBACH ; FREEMAN ALBERT EAMERICAN TELEPHONE & TELEGRAPH
1685913October 2, 1928Recording and reproducing of sound wavesLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1685847October 2, 1928Test clipHERBERT HUNTINGTONAMERICAN TELEPHONE & TELEGRAPH
1685835October 2, 1928Program-selecting arrangementBASCOM HENRY M. ; ARNOLD OSCAR M. ; PENTLAND ROBERT L.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1685801October 2, 1928Current-controlling deviceBALLARD WILLIAM RAMERICAN TELEPHONE & TELEGRAPH
1686585October 9, 1928Telegraph cipher systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1686570October 9, 1928Equipotential cathode vacuum tubeOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1686552October 9, 1928Stabilization of circuit outputFAIRCHILD FRANK EAMERICAN TELEPHONE & TELEGRAPH
1688292October 16, 1928System of modulating carrier currentsALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1687535October 16, 1928Reduction of losses in insulators, pins, and cross armsAFFEL HERMAN A ; GREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1687495October 16, 1928InsulatorGORDON CHESTER S ; LOWE JAMES TAMERICAN TELEPHONE & TELEGRAPH
1687489October 16, 1928Apparatus and method for electrical transmission of picturesBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1688455October 23, 1928Telephone signaling systemDEMAREST CHARLES S ; LOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1688454October 23, 1928Telephone signaling systemDEMAREST CHARLES S ; LOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1688453October 23, 1928Telephone signaling systemDEMAREST CHARLES S ; LOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1688452October 23, 1928Telephone signaling systemDEMAREST CHARLES S ; LOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1688451October 23, 1928Telephone signaling systemDEMAREST CHARLES S ; LOYNES OWEN HAMERICAN TELEPHONE & TELEGRAPH
1689267October 30, 1928Method and apparatus for picture transmissionALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1689263October 30, 1928Printing telegraphyVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1689230October 30, 1928Locking device for switch keysCHRISTOPHER HARRY JAMERICAN TELEPHONE & TELEGRAPH
1690182November 6, 1928Suppression of echoes and singing in four-wire circuitsSILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1690167November 6, 1928Vacuum tube and associated elementHOLDEN WILLIAM H. T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1690153November 6, 1928Selective echo suppressorABRAHAM LEONARD GAMERICAN TELEPHONE & TELEGRAPH
1691150November 13, 1928Electrical power-limiting deviceGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1691091November 13, 1928Alternating-current relayTHOMPSON ELMER OAMERICAN TELEPHONE & TELEGRAPH
1692317November 20, 1928Acoustic wave filterWALTER STEWART GEORGEAMERICAN TELEPHONE & TELEGRAPH
1691990November 20, 1928High-frequency signaling systemPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1691986November 20, 1928Apparatus and method for generating pure sine waves of electromotive forceHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1691962November 20, 1928Selective signaling systemDEMAREST CHARLES SAMERICAN TELEPHONE & TELEGRAPH
1692961November 27, 1928Alternating-current relayTHOMPSON ELMER OAMERICAN TELEPHONE & TELEGRAPH
1692907November 27, 1928Relaying arrangementSHACKLETON SAMUEL P ; HANSEN ARNOLD AAMERICAN TELEPHONE & TELEGRAPH
1692904November 27, 1928Amplification of photo-electric call responsePOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1693685December 4, 1928Method and apparatus for transmission of picturesALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1693662December 4, 1928Radio signaling systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1693659December 4, 1928Echo suppressorHARRY NYQUIST ; PFLEGER KENNETH WAMERICAN TELEPHONE & TELEGRAPH
1693653December 4, 1928Battery supply circuitMCKOWN FREDERICK WAMERICAN TELEPHONE & TELEGRAPH
1695049December 11, 1928Telephone-exchange systemEMIL JACOBSEN ; SPERRY ARTHUR BAMERICAN TELEPHONE & TELEGRAPH
WESTERN ELECTRIC CO
1695043December 11, 1928Telephone-exchange systemHAINES WILLIAM T ; HARPER ROBERT WAMERICAN TELEPHONE & TELEGRAPH
WESTERN ELECTRIC CO
1694429December 11, 1928Auxiliary dialing toolPEAK WARNER LAMERICAN TELEPHONE & TELEGRAPH
1694425December 11, 1928Electrical testing systemMCCURDY RALPH G ; BLYE PAUL WAMERICAN TELEPHONE & TELEGRAPH
1694415December 11, 1928InsulatorGORDON CHESTER SAMERICAN TELEPHONE & TELEGRAPH
1694406December 11, 1928Telephone-exchange systemBASCOM HENRY M ; EMIL JACOBSENAMERICAN TELEPHONE & TELEGRAPH
1695328December 18, 1928Adjustable reference bookGORDON WALTER A ; MURPHY JAMES J ; PASCAL PERRONEAMERICAN TELEPHONE & TELEGRAPH
1695314December 18, 1928Telephone systemBASCOM HENRY M ; ABBOTT HENRY HAMERICAN TELEPHONE & TELEGRAPH
1695312December 18, 1928Telephone systemABBOTT HENRY HAMERICAN TELEPHONE & TELEGRAPH
1696417December 25, 1928Voltage regulatorROBERTS LELAND CAMERICAN TELEPHONE & TELEGRAPH
1696416December 25, 1928Voltage regulatorROBERTS LELAND CAMERICAN TELEPHONE & TELEGRAPH
1696415December 25, 1928Voltage-balance regulatorROBERTS LELAND CAMERICAN TELEPHONE & TELEGRAPH
1697061January 1, 1929Corner-bridle-ring supportGORDON GEORGE BAMERICAN TELEPHONE & TELEGRAPH
1697057January 1, 1929RingerEDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1697042January 1, 1929Radio receiving systemRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1697933January 8, 1929Signaling circuits for repeatersSHACKLETON SAMUEL PAMERICAN TELEPHONE & TELEGRAPH
1697903January 8, 1929Transmission repeating system for radio and carrier telegraph systemsCLAPP ROBERT HAMERICAN TELEPHONE & TELEGRAPH
1698777January 15, 1929RadiorepeaterRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1698772January 15, 1929Remote-control systemSCHRAMM FRED WAMERICAN TELEPHONE & TELEGRAPH
1698770January 15, 1929Signaling circuitsOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1699570January 22, 1929Carrier suppression modulationPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1699567January 22, 1929Radio signaling systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1699553January 22, 1929Picture-transmitting systemALLAN WEAVER ; MCMURRY FRED RAMERICAN TELEPHONE & TELEGRAPH
1700180January 29, 1929Selective telegraph systemCLIFFORD ROBERTS LELANDAMERICAN TELEPHONE & TELEGRAPH
1700168January 29, 1929Cable clamp and bridle ringKLEIN CHARLES H ; ST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1700166January 29, 1929Insulator for bridle wiresBENJAMIN JOHNSONAMERICAN TELEPHONE & TELEGRAPH
1700806February 5, 1929Cone loud-speakerMORRIS ROBERT WAMERICAN TELEPHONE & TELEGRAPH
1700805February 5, 1929Cone loud-speakerMORRIS ROBERT WAMERICAN TELEPHONE & TELEGRAPH
1700799February 5, 1929Locking mechanismINGLIS ALFRED H ; BOSTWICK LEE GAMERICAN TELEPHONE & TELEGRAPH
1701562February 12, 1929InsulatorGORDON CHESTER SAMERICAN TELEPHONE & TELEGRAPH
1701561February 12, 1929InsulatorGORDON CHESTER SAMERICAN TELEPHONE & TELEGRAPH
1701552February 12, 1929Distortion compensatorZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1702308February 19, 1929Intercommunicating systemNILES ELIOT W ; EDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1703147February 26, 1929Rectifier alarm systemHOLDEN WILLIAM H. T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1703146February 26, 1929Rectifier alarm systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1703142February 26, 1929Compensation for phase variationsGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1703972March 5, 1929Printing-telegraph systemFISK WATSON EDWARDAMERICAN TELEPHONE & TELEGRAPH
1703870March 5, 1929RadioantennaDEMAREST CHARLES S ; OHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1704806March 12, 1929Signaling systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1704786March 12, 1929Cross-talk meterCHAPMAN ARTHUR GAMERICAN TELEPHONE & TELEGRAPH
1704780March 12, 1929Method and means for simultaneously signaling all subscribers of carrier telegraph systemsAFFEL HERMAN A ; HAMILTON BAXTER P ; THORP VAUGHN P ; CLAPP ROBERT HAMERICAN TELEPHONE & TELEGRAPH
1705561March 19, 1929Electrical testing systemEDWARDS PAUL G ; HERRINGTON HAROLD WAMERICAN TELEPHONE & TELEGRAPH
1705551March 19, 1929Electrooptical transmissionABRAHAM LEONARD GAMERICAN TELEPHONE & TELEGRAPH
1706538March 26, 1929Testing television and like systemPIERRE MERTZAMERICAN TELEPHONE & TELEGRAPH
1706490March 26, 1929Carrier-amplitude control in radio systemsHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1706472March 26, 1929Echo suppressorWRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1707265April 2, 1929Means for testing lever keysHANSEN ARNOLD AAMERICAN TELEPHONE & TELEGRAPH
1707261April 2, 1929Recording and reproduction of sound wavesFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1707260April 2, 1929Recording and reproducing of sound wavesFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1708038April 9, 1929Low-loss insulatorWILSON LEON TAMERICAN TELEPHONE & TELEGRAPH
1708027April 9, 1929Control device for vacuum tubesOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1707997April 9, 1929Telegraph systemSHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1709037April 16, 1929Distortion compensatorPERO SALLIE EAMERICAN TELEPHONE & TELEGRAPH
1709009April 16, 1929Multiple-channel radioreceiverLLOYD ESPENSCHIED ; MARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1708974April 16, 1929Submarine-cable telegraphyPARKER RALZEMOND D ; OVERTON WARNER LAMERICAN TELEPHONE & TELEGRAPH
1709926April 23, 1929Apparatus and method for transmitting picturesALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1709901April 23, 1929Secret-signaling systemESPENSCHIED LLOYD ; GILLETT GLENN D.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1709900April 23, 1929Telephone systemEGINHARD DIETZEAMERICAN TELEPHONE & TELEGRAPH
1711101April 30, 1929Means for indicating frequency changesSHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1710787April 30, 1929Method and means for producing insulating sleevesPIKE VERNON BENDER ; JOHN EVERETT ST.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1710786April 30, 1929Method and means for producing insulating sleevesPIKE VERNON B ; ST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1710756April 30, 1929Reduction of attenuation due to the conductance losses in cross arms and insulator pinsWILSON LEON TAMERICAN TELEPHONE & TELEGRAPH
1711562May 7, 1929Echo-suppressor circuitsFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1711560May 7, 1929Radio broadcasting systemLLOYD ESPENSCHIED ; RALPH BOWN ; MARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1711550May 7, 1929Alternating-current relaySTURDY WILLIAM WAMERICAN TELEPHONE & TELEGRAPH
1713039May 14, 1929Phonograph recording and reproducingLLOYD ESPENSCHIEDAMERICAN TELEPHONE & TELEGRAPH
1712542May 14, 1929Toll trunk circuitBAILEY RAND SAMERICAN TELEPHONE & TELEGRAPH
1712541May 14, 1929Wire-splicing machineWRIGHT JOHN WAMERICAN TELEPHONE & TELEGRAPH
1712528May 14, 1929Printing-telegraph systemSWEZEY BURDETTE SAMERICAN TELEPHONE & TELEGRAPH
1713618May 21, 1929Electric picture-transmitting apparatusOVERTON WARNER LAMERICAN TELEPHONE & TELEGRAPH
1713615May 21, 1929Thermionic vacuum tubeOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1713603May 21, 1929Electrical networkHOYT RAY SAMERICAN TELEPHONE & TELEGRAPH
1714567May 28, 1929Telegraph circuitHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1714551May 28, 1929Cable-testing arrangementEDWARDS PAUL G ; HERRINGTON HAROLD WAMERICAN TELEPHONE & TELEGRAPH
1714525May 28, 1929Suppression of echoes and singing in four-wire circuitsSILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1715475June 4, 1929Electrical protective systemSHETZLINE ROY AAMERICAN TELEPHONE & TELEGRAPH
1715433June 4, 1929Antenna arraySTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1715415June 4, 1929Volume-control systemHANSON OSCAR B ; GEORGE CRISSON ; MCKOWN FREDERICK WAMERICAN TELEPHONE & TELEGRAPH
1717074June 11, 1929Telephone-exchange maintenance systemTAPLIN CARLETON V. ; ALLEN LOUIS M. ; BERTELS ARNOLD S.THE AMERICAN TELEPHONE AND TELEGRAPH COMPANY
BELL TELEPHONE LABORATORIES, INCORPORATED
1716438June 11, 1929Testing systemGANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1716437June 11, 1929Testing systemGANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1717475June 18, 1929Alternating-current relayTHOMPSON ELMER OAMERICAN TELEPHONE & TELEGRAPH
1717410June 18, 1929Attenuation compensatorROBERTS LELAND CAMERICAN TELEPHONE & TELEGRAPH
1717400June 18, 1929Phase-shifting networkHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1718301June 25, 1929Operator's telephone circuitNELSON STANLEY FAMERICAN TELEPHONE & TELEGRAPH
1718291June 25, 1929BuckleRAYMOND GUENTHERAMERICAN TELEPHONE & TELEGRAPH
1718280June 25, 1929Spring-jack connectionEDWARDS PAUL GAMERICAN TELEPHONE & TELEGRAPH
1719052July 2, 1929Single-side-band carrier systemGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1719047July 2, 1929Volume-range-control systemCLARK ALVA B ; GEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1719041July 2, 1929Carrier-amplitude-control systemBLACKWELL OTTO B ; STRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1719916July 9, 1929Picture-transmitting systemWATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1719896July 9, 1929Reduction of fading of radiosignalsMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1719845July 9, 1929Reduction of fading of radiosignalsMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1720777July 16, 1929Electrical networkZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1720770July 16, 1929Associated resonant circuitsSTONE STONE JOHNAMERICAN TELEPHONE & TELEGRAPH
1720746July 16, 1929Support for wiresPOVLSEN PAUL K ; ST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1721574July 23, 1929Transmission level regulationPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1721572July 23, 1929Carrier-current system superposed on side circuit of phantom systemO'LEARY JOSEPH TAMERICAN TELEPHONE & TELEGRAPH
1721567July 23, 1929Multiplex radio transmitting systemMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1722283July 30, 1929Telegraph systemEYSTER JAMES AAMERICAN TELEPHONE & TELEGRAPH
1722274July 30, 1929Telautograph systemCLARK ALVA B ; PIERRE MERTZAMERICAN TELEPHONE & TELEGRAPH
1722262July 30, 1929Telephone-exchange systemBASCOM HENRY M.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1723220August 6, 1929Carrier-telegraph alarm systemTHORP VAUGHN PAMERICAN TELEPHONE & TELEGRAPH
1723153August 6, 1929Telephone systemGREEN IRVING WAMERICAN TELEPHONE & TELEGRAPH
1723123August 6, 1929Telephone systemBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1724082August 13, 1929Means to control cross talkGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1724057August 13, 1929Radio receiving setALLAN WEAVER ; HAROLD CHASE FAYAMERICAN TELEPHONE & TELEGRAPH
1724019August 13, 1929Radio receiving systemHARPER AUGUSTUS EAMERICAN TELEPHONE & TELEGRAPH
1725691August 20, 1929System of electrical distributionAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1724987August 20, 1929Selective-constant-resistance networkZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1724925August 20, 1929Carrier-signaling systemGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1724898August 20, 1929Telephone systemBAILEY RAND S ; EAGON LLOYD LAMERICAN TELEPHONE & TELEGRAPH
1725757August 27, 1929Call-charging telephone-exchange systemHAINES WILLIAM TAMERICAN TELEPHONE & TELEGRAPH
1725756August 27, 1929Determination of delay by impedance measurementsGANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1725753August 27, 1929Office-selecting means for telephone trunk circuitsDAVIDSON JR JOHN ; PHELPS HENRY EAMERICAN TELEPHONE & TELEGRAPH
1726622September 3, 1929RadioreceiverHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1726580September 3, 1929Thermionic vacuum tubeOHL RUSSELL S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1726578September 3, 1929Secret telephone systemHARRY NYQUIST ; PIERRE MERTZAMERICAN TELEPHONE & TELEGRAPH
1727408September 10, 1929Control of regeneration in signaling systemsOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1727388September 10, 1929High-frequency measuring systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1727328September 10, 1929High-frequency measuring systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1728247September 17, 1929Echo suppressorDOREN MITCHELLAMERICAN TELEPHONE & TELEGRAPH
1728239September 17, 1929Arrangement for establishing time intervalsGREEN IRVING WAMERICAN TELEPHONE & TELEGRAPH
1728226September 17, 1929Telegraph repeaterBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1728986September 24, 1929Picture-transmission systemSTOKES HOWARD GAMERICAN TELEPHONE & TELEGRAPH
1728978September 24, 1929Telegraphic transmission of picturesPARKER RALZEMOND DAMERICAN TELEPHONE & TELEGRAPH
1728975September 24, 1929Premature-disconnect signal for telephone circuitsMORRIS ROBERT W ; NELSON STANLEY FAMERICAN TELEPHONE & TELEGRAPH
1729649October 1, 1929Program transmission over wiresTOOMEY JOHN F. ; PHELPS HENRY E.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1729645October 1, 1929Signaling systemPIERRE MERTZAMERICAN TELEPHONE & TELEGRAPH
1729644October 1, 1929Electrical testing systemHENNEBERGER THOMAS CAMERICAN TELEPHONE & TELEGRAPH
1730402October 8, 1929Testing apparatus for electrical circuitsABBOTT HENRY H ; KUHN GEORGE WAMERICAN TELEPHONE & TELEGRAPH
1730368October 8, 1929Method of and means for measuring differences in time of propagation of wave fronts of different frequencies over a circuitJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1731264October 15, 1929Apparatus for controlling the output of alternating-current generatorsPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1731243October 15, 1929Signaling systemJEFFERSON EHRLICHAMERICAN TELEPHONE & TELEGRAPH
1732312October 22, 1929Electrical delay networkHARRY NYQUIST ; PFLEGER KENNETH WAMERICAN TELEPHONE & TELEGRAPH
1732311October 22, 1929Method and apparatus for testing networksHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1732286October 22, 1929Telegraph systemSHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1732255October 22, 1929Telegraph-monitoring systemBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1733172October 29, 1929Collapsible supportSTOVER HERBERT FAMERICAN TELEPHONE & TELEGRAPH
1733165October 29, 1929Synchronizing arrangement for moving-picture projectorsPERRY DONALD BAMERICAN TELEPHONE & TELEGRAPH
1733130October 29, 1929Telephone signaling circuitsNILES ELIOT W ; EDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1733127October 29, 1929Signaling circuitsLEWIS BENJAMIN FAMERICAN TELEPHONE & TELEGRAPH
1733121October 29, 1929Telephone or other boothGIDDIS GEORGE FAMERICAN TELEPHONE & TELEGRAPH
1734124November 5, 1929Universal telephone setGREEN IRVING W ; INGLIS ALFRED HAMERICAN TELEPHONE & TELEGRAPH
1734113November 5, 1929Telephone repeater circuitsCLARK ALVA B ; GEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1734112November 5, 1929Radio receiving systemCARSON JOHN RAMERICAN TELEPHONE & TELEGRAPH
1734104November 5, 1929Two-way transmission with repeatersWRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1734038November 5, 1929Electrical transmission of energyLUCIEN LEVYAMERICAN TELEPHONE & TELEGRAPH
1735742November 12, 1929Wave filterFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1735053November 12, 1929Radio signaling systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1735052November 12, 1929Phase-compensating networksNYQUIST HARRYAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1735044November 12, 1929Frequency-equalization carrier systemGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1735041November 12, 1929Carrier-telegraph alarm systemGARDNER FRED GAMERICAN TELEPHONE & TELEGRAPH
1735037November 12, 1929Method of and apparatus for reducing width of transmission bandsALLEN CARPEAMERICAN TELEPHONE & TELEGRAPH
1735943November 19, 1929Method of and means for testing telegraph transmissionFISK WATSON EDWARD ; STEVENS SWEZEY BURDETTEAMERICAN TELEPHONE & TELEGRAPH
1735939November 19, 1929Drive ringST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1735933November 19, 1929Method of testing telegraph transmissionHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1735905November 19, 1929Microphone mountingMARTIN WILLIAM H ; STRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1736816November 26, 1929Alternating-current relayALMQUIST MILTON LAMERICAN TELEPHONE & TELEGRAPH
1736814November 26, 1929Electrical transposition systemAFFEL HERMAN A.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1736785November 26, 1929Measuring systemHAINES WILLIAM TAMERICAN TELEPHONE & TELEGRAPH
1736783November 26, 1929Measurement of electrical resistanceGARY LAURENCE A ; TASKER HOMER GAMERICAN TELEPHONE & TELEGRAPH
1738000December 3, 1929Means for and method of volume control of transmissionGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1737992December 3, 1929Volume-control systemBOSTWICK LEE GAMERICAN TELEPHONE & TELEGRAPH
1737830December 3, 1929Means for and method of volume control of transmissionGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1737672December 3, 1929Radio printing-telegraph systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1737671December 3, 1929Multichannel radio printing-telegraph systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1737668December 3, 1929Signaling systemMOREHOUSE LYMAN F ; WATSON EDWARD FAMERICAN TELEPHONE & TELEGRAPH
1737652December 3, 1929Ballast lamp and filament-activity test for repeatersGANNETT DANFORTH KAMERICAN TELEPHONE & TELEGRAPH
1737640December 3, 1929Machine for producing insulating sleevesCHANNELL JAMES WAMERICAN TELEPHONE & TELEGRAPH
1738653December 10, 1929Telephone receiverINGLIS ALFRED H ; RAYMOND GUENTHERAMERICAN TELEPHONE & TELEGRAPH
1738536December 10, 1929Echo suppressorDOREN MITCHELL ; SILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1738524December 10, 1929Device for locking evacuated tubesCHRISTOPHER HARRY JAMERICAN TELEPHONE & TELEGRAPH
1738522December 10, 1929Electromagnetic wave signaling systemCAMPBELL GEORGE AAMERICAN TELEPHONE & TELEGRAPH
1738519December 10, 1929Signaling system for subscribers' telephone circuitsABBOTT HENRY HAMERICAN TELEPHONE & TELEGRAPH
1739606December 17, 1929Echo suppressorHARRY NYQUIST ; PFLEGER KENNETH WAMERICAN TELEPHONE & TELEGRAPH
1739532December 17, 1929Remote control of repeatersTAYLOR EDMUND RAMERICAN TELEPHONE & TELEGRAPH
1739531December 17, 1929Remote control systemTAYLOR EDMUND RAMERICAN TELEPHONE & TELEGRAPH
1739520December 17, 1929Radioreceiving circuitsPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1739494December 17, 1929Piezo-electric interference eliminatorAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1740856December 24, 1929Volume regulation in two-way telephone circuitsJOSEPH HERMAN ; WRIGHT SUMNER BAMERICAN TELEPHONE & TELEGRAPH
1740621December 24, 1929Suppression of echoes and singing in four-wire circuitsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1740491December 24, 1929Compensation for phase variationsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1741926December 31, 1929Compound loading systemFRENCH NORMAN RAMERICAN TELEPHONE & TELEGRAPH
1741375December 31, 1929Current-equalizing deviceNILES ELIOT W ; EDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1741363December 31, 1929Piezo-electric interference eliminatorGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1741356December 31, 1929Protective device for electric circuitsBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1741272December 31, 1929Telephone systemBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1742927January 7, 1930Telephone-exchange systemNICOLL ROBERT I D ; DAVIS RICHARD C ; VON NOSTITZ ERICHBELL TELEPHONE LABOR INC
AMERICAN TELEPHONE & TELEGRAPH
1742293January 7, 1930Tape cutting and pasting deviceWATSON EDWARD F ; SWEZEY BURDETTE SAMERICAN TELEPHONE & TELEGRAPH
1742291January 7, 1930Selective signaling systemTHOMPSON GEORGE KAMERICAN TELEPHONE & TELEGRAPH
1742252January 7, 1930Piezo-electric frequency eliminatorHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1742251January 7, 1930Amplifying systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1742243January 7, 1930Cable clamp and bridle ringFISH LEWIN BAMERICAN TELEPHONE & TELEGRAPH
1743588January 14, 1930Carrier transmission system for printing telegraphyAFFEL HERMAN A ; HAMILTON BAXTER PAMERICAN TELEPHONE & TELEGRAPH
1743260January 14, 1930Means and method for maintaining constant transmission efficiencyZINN MANVEL KAMERICAN TELEPHONE & TELEGRAPH
1743245January 14, 1930Apparatus for spraying liquidsSMITH TEMPLE CAMERICAN TELEPHONE & TELEGRAPH
1743180January 14, 1930Picture-transmitting systemABRAHAM LEONARD GAMERICAN TELEPHONE & TELEGRAPH
1743141January 14, 1930Equalization of carrier systemsILGENFRITZ LESTER MAMERICAN TELEPHONE & TELEGRAPH
1743132January 14, 1930Equalization of carrier systemsGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1744063January 21, 1930Bridge duplex telegraph systemWILBURN SIDNEY DAMERICAN TELEPHONE & TELEGRAPH
1744058January 21, 1930Electrical protective systemSHETZLINE ROY AAMERICAN TELEPHONE & TELEGRAPH
1744053January 21, 1930Signaling systemMILLER CHARLES GAMERICAN TELEPHONE & TELEGRAPH
1744044January 21, 1930Single-side-band carrier systemGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1744031January 21, 1930Measurement of active-balance componentsABRAHAM LEONARD GAMERICAN TELEPHONE & TELEGRAPH
1744918January 28, 1930Telephone systemPHELPS HENRY E ; DAVIDSON JR JOHNAMERICAN TELEPHONE & TELEGRAPH
1744887January 28, 1930Device for introducing gas into cablesGRUENE WILLIAM JAMERICAN TELEPHONE & TELEGRAPH
1744840January 28, 1930Voltage-indicating and translating deviceSTRIEBY MAURICE E. ; FETTER CHARLES H.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1744836January 28, 1930Carrier-amplitude control in radio systemsOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1744835January 28, 1930Constant-frequency oscillatorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1745457February 4, 1930Echo suppressorSILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1745419February 4, 1930Apparatus for testing open-wire jointsHENNEBERGER THOMAS CAMERICAN TELEPHONE & TELEGRAPH
1745415February 4, 1930Carrier amplitude control systemGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1745376February 4, 1930Short-wave radioreceiverOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1745369February 4, 1930Unipotential-cathode vacuum tubeHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1746793February 11, 1930Trunking systemRHODES WILLIAM A ; DAHL JACK FAMERICAN TELEPHONE & TELEGRAPH
WESTERN ELECTRIC CO
1746314February 11, 1930Loading system for long submarine cablesLEWIS BENJAMIN FAMERICAN TELEPHONE & TELEGRAPH
1746305February 11, 1930Radio signaling systemESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1746304February 11, 1930Method for measuring the end-section capacity of coil-loaded telephone circuitsCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1746241February 11, 1930Transmission-measuring systemCLARK ALVA B ; BEST FRED HAMERICAN TELEPHONE & TELEGRAPH
1746239February 11, 1930Transmission-measuring systemBEST FRED HAMERICAN TELEPHONE & TELEGRAPH
1747236February 18, 1930Automatic selection of receiving channelsGILLETT GLENN DAMERICAN TELEPHONE & TELEGRAPH
1747221February 18, 1930Automatic selection of receiving channelsRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1747220February 18, 1930Automatic selection of receiving channelsRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1747218February 18, 1930Automatic selection of receiving channelsBOHN WILLIAM CAMERICAN TELEPHONE & TELEGRAPH
1747160February 18, 1930Single-side band-carrier systemALLEN CARPEAMERICAN TELEPHONE & TELEGRAPH
1748192February 25, 1930Measurement of echoesSATTERTHWAITE JOSHUA P ; DINGMAN JAMES EAMERICAN TELEPHONE & TELEGRAPH
1748186February 25, 1930Signaling systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1748175February 25, 1930Thermionic vacuum tubeHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1748171February 25, 1930Measurement of echoesCLARK ALVA BAMERICAN TELEPHONE & TELEGRAPH
1748166February 25, 1930Telephone-exchange systemBASCOM HENRY M ; HAINES WILLIAM TAMERICAN TELEPHONE & TELEGRAPH
1749048March 4, 1930Carrier-telegraph alarm systemTHORP VAUGHN P ; REA WILTON TAMERICAN TELEPHONE & TELEGRAPH
1749045March 4, 1930Signaling systemHARRY NYQUIST ; PFLEGER KENNETH WAMERICAN TELEPHONE & TELEGRAPH
1749044March 4, 1930MeterNILES ELIOT WAMERICAN TELEPHONE & TELEGRAPH
1749023March 4, 1930MeterEDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1749015March 4, 1930MeterBISBEE FREDERICK CAMERICAN TELEPHONE & TELEGRAPH
1749851March 11, 1930Circuit controllerSILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1749844March 11, 1930System for furnishing intermittent telegraph serviceROBERTS LELAND CAMERICAN TELEPHONE & TELEGRAPH
1749841March 11, 1930Voice-operated relay equipmentHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1749838March 11, 1930Selective systemNILES ELIOT WAMERICAN TELEPHONE & TELEGRAPH
1749825March 11, 1930Telegraph systemLOYE DONALD PAMERICAN TELEPHONE & TELEGRAPH
1750694March 18, 1930Drive ringST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1750688March 18, 1930Signaling systemPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1750668March 18, 1930Determining movement and position of moving objectsGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1750666March 18, 1930Toll circuitGLEZEN LEE L ; STIGERS MORTON J ; TAYLOR EDMUND RAMERICAN TELEPHONE & TELEGRAPH
1750661March 18, 1930Cathode-ray oscillographBOWN RALPHAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1751527March 25, 1930Distortionless amplifying systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1751522March 25, 1930Multiple-way connection for transmission linesDOREN MITCHELL ; SILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1751516March 25, 1930Common-frequency broadcasting systemGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1751510March 25, 1930Method and apparatus for making jointsJAMES CUNNINGHAMAMERICAN TELEPHONE & TELEGRAPH
1751509March 25, 1930Electric soldering machineJAMES CUNNINGHAMAMERICAN TELEPHONE & TELEGRAPH
1752360April 1, 1930Reduction of static interference in carrier systemsAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1752347April 1, 1930Reduction of atmospheric disturbanceLEIBE FRANK AAMERICAN TELEPHONE & TELEGRAPH
1752346April 1, 1930Interference neutralizer for alternating-current telegraph systemsKELLEY LEO A ; NEWTON MONK ; THORP VAUGHN PAMERICAN TELEPHONE & TELEGRAPH
1752345April 1, 1930Reduction of atmospheric disturbanceKELLEY LEO AAMERICAN TELEPHONE & TELEGRAPH
1752344April 1, 1930Reduction of atmospheric interferenceKELLEY LEO AAMERICAN TELEPHONE & TELEGRAPH
1752330April 1, 1930Suppression of interference in carrier telegraph systemsCLAPP ROBERT HAMERICAN TELEPHONE & TELEGRAPH
1752326April 1, 1930Reduction of static interference in carrier systemsBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1752325April 1, 1930Reduction of static interference in carrier systemsBRANSON DAVID EAMERICAN TELEPHONE & TELEGRAPH
1752303April 1, 1930Interference neutralizer for alternating-current telegraph systemsKELLEY LEO AAMERICAN TELEPHONE & TELEGRAPH
1753869April 8, 1930Method and means for preparing insulating sleevesREED THOMAS C ; ODELL AUBREY DAMERICAN TELEPHONE & TELEGRAPH
1753715April 8, 1930Short-wave radio signaling systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1753446April 8, 1930Signaling systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1753445April 8, 1930Signaling systemOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1753444April 8, 1930Signaling systemOHL RUSSELL S.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1753256April 8, 1930Alternating-current relayTHORP VAUGHN PAMERICAN TELEPHONE & TELEGRAPH
1753231April 8, 1930Meter for transmission testingBEST FRED HAMERICAN TELEPHONE & TELEGRAPH
1753230April 8, 1930MeterBEST FRED HAMERICAN TELEPHONE & TELEGRAPH
1754240April 15, 1930Composite telephone and telegraph systemHARRY NYQUIST ; SMART BRANDAMERICAN TELEPHONE & TELEGRAPH
1754239April 15, 1930Telephone signaling systemNILES ELIOT W ; EDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1754238April 15, 1930Coin-box deviceNILES ELIOT W ; EDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1754234April 15, 1930Vacuum tubeHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1754224April 15, 1930Signaling systemDAVIDSON JR JOHN ; MOODY DWIGHT LAMERICAN TELEPHONE & TELEGRAPH
1755266April 22, 1930Tuned radio frequency amplifierOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1755258April 22, 1930Battery-charging circuitsHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1755257April 22, 1930Vacuum tube and method of preparing the sameHOLDEN WILLIAM H. T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1755244April 22, 1930Device for measuring level differencesEGINHARD DIETZEAMERICAN TELEPHONE & TELEGRAPH
1755243April 22, 1930Signaling means for telephone systemsCRISSON GEORGEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1756132April 29, 1930High-frequency-oscillation generatorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1756131April 29, 1930High-frequency-oscillation generatorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1756130April 29, 1930Oscillation generatorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1756102April 29, 1930Telephone systemROSEKRANS WILFRED MAMERICAN TELEPHONE & TELEGRAPH
1756097April 29, 1930Electrical delay-circuit arrangementNILES ELIOT W ; EDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1757225May 6, 1930Telegraph alarm circuitSINGER FRED JAMERICAN TELEPHONE & TELEGRAPH
1757217May 6, 1930Telephone systemRHODES WILLIAM AAMERICAN TELEPHONE & TELEGRAPH
1757181May 6, 1930Privacy system for telephone transmissionESPENSCHIED LLOYDAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1757173May 6, 1930Combined cutter and pressure roller deviceDINGMAN JAMES E ; ENGELBERT ROBERT FAMERICAN TELEPHONE & TELEGRAPH
1758058May 13, 1930High-frequency communication systemPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1758044May 13, 1930Wave antennaHOYT RAY SAMERICAN TELEPHONE & TELEGRAPH
1758029May 13, 1930Pole planerCOLE ORANGE R ; GARLINGER MARSHALL TAMERICAN TELEPHONE & TELEGRAPH
1758025May 13, 1930Pole planerBOLIN CARLETON HAMERICAN TELEPHONE & TELEGRAPH
1759026May 20, 1930Telegraph apparatusTERRIBERRY WARREN SAMERICAN TELEPHONE & TELEGRAPH
1759023May 20, 1930Electrical protective deviceSCHIRMER AUGUST HAMERICAN TELEPHONE & TELEGRAPH
1759019May 20, 1930Electrical testing systemMURPHY JOHN BAMERICAN TELEPHONE & TELEGRAPH
1759000May 20, 1930Radio signaling systemCHAPMAN ARTHUR GAMERICAN TELEPHONE & TELEGRAPH
1758933May 20, 1930Transposed and tapered antennaCHAPMAN ARTHUR GAMERICAN TELEPHONE & TELEGRAPH
1759952May 27, 1930Electrical transmission systemMCCURDY RALPH GAMERICAN TELEPHONE & TELEGRAPH
1759950May 27, 1930Alternating-current telegraph systemMATTE ANDREW LAMERICAN TELEPHONE & TELEGRAPH
1759938May 27, 1930Coordination of direction-finder observationsDEAN SAMUEL WAMERICAN TELEPHONE & TELEGRAPH
1759933May 27, 1930Contact-making deviceBONELL RALPH KAMERICAN TELEPHONE & TELEGRAPH
1759915May 27, 1930Photo-electric cellPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1760984June 3, 1930Transoceanic radio telephone systemHAMILTON HAROLD SAMERICAN TELEPHONE & TELEGRAPH
1760983June 3, 1930InsulatorGORDON CHESTER S ; LOWE JAMES TAMERICAN TELEPHONE & TELEGRAPH
1760973June 3, 1930Electrical networkZOBEL OTTO JAMERICAN TELEPHONE & TELEGRAPH
1760957June 3, 1930Vacuum-tube detectorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1760920June 3, 1930Testing systemSTROMBERG SVEN EAMERICAN TELEPHONE & TELEGRAPH
1762279June 10, 1930Transmission systemSINGER FRED J.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1762278June 10, 1930Transmission systemSINGER FRED JAMERICAN TELEPHONE & TELEGRAPH
1762255June 10, 1930Method of plugging cablesBALDWIN CHARLES EAMERICAN TELEPHONE & TELEGRAPH
1762252June 10, 1930Printing-telegraph exchange systemVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1762212June 10, 1930Thermionic vacuum tubeCARTER JR CHARLES WAMERICAN TELEPHONE & TELEGRAPH
1763770June 17, 1930Cable clamp and bridle ringFISH LEWIN B ; ST JOHN EVERETTAMERICAN TELEPHONE & TELEGRAPH
1763751June 17, 1930Radio receiving systemRALPH BOWNAMERICAN TELEPHONE & TELEGRAPH
1765607June 24, 1930Amplifying deviceOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1765606June 24, 1930Harmonic producerOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1765585June 24, 1930Set for measuring operating time of relaysJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1769479July 1, 1930Cable gripWHALEY SHERMAN EAMERICAN TELEPHONE & TELEGRAPH
1769431July 1, 1930Electrical-communication-receiving apparatusJOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1769270July 1, 1930Harmonic producerOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1769969July 8, 1930Neutralizing transformer arrangementTHOMAS SHAWAMERICAN TELEPHONE & TELEGRAPH
1769962July 8, 1930Apparatus for testing and repairing telephone circuitsHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1769959July 8, 1930Loading systemMEAD SALLIE P ; FRENCH NORMAN RAMERICAN TELEPHONE & TELEGRAPH
1770422July 15, 1930Phase-compensating networkHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1771453July 29, 1930Regenerative telegraph repeaterVERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1771446July 29, 1930Regenerative telegraph repeaterPARKER RALZEMOND D ; VERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1771445July 29, 1930Regenerative telegraph repeaterPARKER RALZEMOND D ; VERNAM GILBERT SAMERICAN TELEPHONE & TELEGRAPH
1772168August 5, 1930Multiplex broadcasting systemTAYLOR EDMUND R ; HANSON OSCAR BAMERICAN TELEPHONE & TELEGRAPH
1772167August 5, 1930Signaling systemTAYLOR EDMUND RAMERICAN TELEPHONE & TELEGRAPH
1772166August 5, 1930Multiplex broadcast systemTAYLOR EDMUND RAMERICAN TELEPHONE & TELEGRAPH
1772165August 5, 1930Multiplex broadcast systemTAYLOR EDMUND R ; HANSON OSCAR BAMERICAN TELEPHONE & TELEGRAPH
1772552August 12, 1930Echo suppressorDOREN MITCHELL ; JOSEPH HERMANAMERICAN TELEPHONE & TELEGRAPH
1772551August 12, 1930Echo suppressorDOREN MITCHELL ; SILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1772550August 12, 1930Echo suppressorDOREN MITCHELL ; SILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1772519August 12, 1930Electrooptical transmissionPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1772517August 12, 1930RadioreceiverOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1772508August 12, 1930Voltage-limiting deviceBASCOM HENRY MAMERICAN TELEPHONE & TELEGRAPH
1772506August 12, 1930Wave filterAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1773126August 19, 1930Transmission systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1773119August 19, 1930Electrooptical transmission systemREYNOLDS FREDERICK WAMERICAN TELEPHONE & TELEGRAPH
1773116August 19, 1930Single-side-band systemPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1773097August 19, 1930Staggered-wave antenna systemDEAN SAMUEL WAMERICAN TELEPHONE & TELEGRAPH
1773092August 19, 1930Carrier telegraph circuitsCLAPP ROBERT HAMERICAN TELEPHONE & TELEGRAPH
1773798August 26, 1930Carrier-current telegraph systemTHORP VAUGHN PAMERICAN TELEPHONE & TELEGRAPH
1773789August 26, 1930Carrier-current telegraph systemREA WILTON TAMERICAN TELEPHONE & TELEGRAPH
1773785August 26, 1930Electrooptical systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1773776August 26, 1930Telephone conference arrangementGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1773772August 26, 1930Harmonic suppressorBERTHOLD OSCAR HAMERICAN TELEPHONE & TELEGRAPH
1775775September 16, 1930Method of and means for wave retardationHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1775752September 16, 1930Oscillation generatorEDWARDS WILLIAM HAMERICAN TELEPHONE & TELEGRAPH
1775742September 16, 1930Sheet-mounting deviceHAROLD THOMSON WILLIAMAMERICAN TELEPHONE & TELEGRAPH
1776311September 23, 1930Repeater systemGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1776310September 23, 1930Two-way negative-impedance repeaterGEORGE CRISSONAMERICAN TELEPHONE & TELEGRAPH
1776301September 23, 1930Coin-controlled apparatusTHOMPSON GEORGE KAMERICAN TELEPHONE & TELEGRAPH
1777016September 30, 1930Electrootical image-producing systemPOTTER RALPH K.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1776822September 30, 1930Automatic volume-control systemSTRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1776821September 30, 1930Automatic volume-control systemSTRIEBY MAURICE EAMERICAN TELEPHONE & TELEGRAPH
1777378October 7, 1930Photo-electric cellPOTTER RALPH KAMERICAN TELEPHONE & TELEGRAPH
1777374October 7, 1930Wave antennaMARTIN DE LOSS KAMERICAN TELEPHONE & TELEGRAPH
1777355October 7, 1930Transmission-level-controlling deviceFETTER CHARLES HAMERICAN TELEPHONE & TELEGRAPH
1778407October 14, 1930Selective switchWALTERS JAMES N ; CLARK EDGAR HAMERICAN TELEPHONE & TELEGRAPH
BELL TELEPHONE LABOR INC
1778086October 14, 1930Apparatus for pulling cables through conduitsPALM SAMUEL M ; SNYDER JOHN FAMERICAN TELEPHONE AND TELEPHO
1778085October 14, 1930Distortionless amplifying systemHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH
1778077October 14, 1930Remote-control systemHOLDEN WILLIAM H TAMERICAN TELEPHONE & TELEGRAPH
1779500October 28, 1930Tone reception for carrier telegraphySHANCK ROY BAMERICAN TELEPHONE & TELEGRAPH
1779495October 28, 1930Substation rectification of carrier telegraph currentsROBERTS LELAND CAMERICAN TELEPHONE & TELEGRAPH
1779493October 28, 1930Carrier-current telegraph systemREA WILTON T.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1779492October 28, 1930Carrier-current telegraph systemREA WILTON TAMERICAN TELEPHONE & TELEGRAPH
1780364November 4, 1930Electrooptical transmissionREYNOLDS FREDERICK WAMERICAN TELEPHONE & TELEGRAPH
1780245November 4, 1930Telephone and telegraph systemROBERTS LELAND CAMERICAN TELEPHONE & TELEGRAPH
1780244November 4, 1930Telephone and telegraph circuitRITTER PAUL EAMERICAN TELEPHONE & TELEGRAPH
1780229November 4, 1930Oscillation generatorGREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1781124November 11, 1930Concentric conducting systemNEIN HARRY RAMERICAN TELEPHONE & TELEGRAPH
1781093November 11, 1930Concentric conductor systemAFFEL HERMAN AAMERICAN TELEPHONE & TELEGRAPH
1781092November 11, 1930Concentric conducting systemAFFEL HERMAN A ; GREEN ESTILL IAMERICAN TELEPHONE & TELEGRAPH
1780966November 11, 1930Electrical transmission systemBLYE PAUL WAMERICAN TELEPHONE & TELEGRAPH
1780963November 11, 1930Radio signaling systemAUSTIN BAILEYAMERICAN TELEPHONE & TELEGRAPH
1780962November 11, 1930Radio signaling systemAUSTIN BAILEY ; WINTHROP DEAN SAMUELAMERICAN TELEPHONE & TELEGRAPH
1783132November 25, 1930Mounting for piezo-electric devicesOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1783131November 25, 1930Mounting for piezo-electric devicesOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1783130November 25, 1930Piezo-electric oscillatorOHL RUSSELL SAMERICAN TELEPHONE & TELEGRAPH
1783321December 2, 1930Electrical transmission of picturesALLAN WEAVERAMERICAN TELEPHONE & TELEGRAPH
1784194December 9, 1930Transmission frequency-delay-measuring circuitDOREN MITCHELLAMERICAN TELEPHONE & TELEGRAPH
1784178December 9, 1930Voice-controlled circuitsALLEN CARPEAMERICAN TELEPHONE & TELEGRAPH
1784176December 9, 1930Equalization for carrier systemsALLEN CARPEAMERICAN TELEPHONE & TELEGRAPH
1784905December 16, 1930Telephone-exchange systemMORENCY GEORGE HAMERICAN TELEPHONE & TELEGRAPH
1784898December 16, 1930Circuit switchGARY LAURENCE A ; TASKER HOMER GAMERICAN TELEPHONE & TELEGRAPH
1784891December 16, 1930Privacy signaling systemDEAN SAMUEL W ; ANDERSON CLIFFORD NAMERICAN TELEPHONE & TELEGRAPH
1786412December 23, 1930Shielding arrangementCRISSON GEORGEAMERICAN TELEPHONE AND TELEGRAPH COMPANY
1785819December 23, 1930Prevention of parasitic oscillationsSILENT HAROLD CAMERICAN TELEPHONE & TELEGRAPH
1785818December 23, 1930Telephone systemPETERSON GEORGE H ; RHODES WILLIAM AAMERICAN TELEPHONE & TELEGRAPH
1786565December 30, 1930Thrust bearingFREEMAN ALBERT EAMERICAN TELEPHONE & TELEGRAPH
1786549December 30, 1930Method and means for preparing insulating sleevesREED THOMAS C. ; ODELL AUBREY D.AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1786546December 30, 1930Power-standard deviceHARRY NYQUISTAMERICAN TELEPHONE & TELEGRAPH