Patent Date Title Inventor Assignee
1578634March 30, 1926Clamping and supporting deviceCHARLES BORGMANNBELL TELEPHONE LABOR INC
1580850April 13, 1926Electron-discharge deviceOTIS RUSSELL M ; FUNK WILBUR FBELL TELEPHONE LABOR INC
1606571November 9, 1926RelayHEISING RAYMOND ABELL TELEPHONE LABOR INC
1606817November 16, 1926Electrical networkSTEVENSON GEORGE HBELL TELEPHONE LABOR INC
1611711December 21, 1926Telephone systemBEAUMONT WILLIAM MBELL TELEPHONE LABOR INC
1614254January 11, 1927Voltage-limiting devicePERSONS GEORGE A.BELL TELEPHONE LABORATORIES INCORPORATED
1615935February 1, 1927Manual telephone systemDAVIS RICHARD C. ; CONWAY ROY D.BELL TELEPHONE LABORATORIES, INCORPORATED
1623734April 5, 1927Telephone systemKING RALPH E. ; BEAUMONT WILLIAM M.BELL TELEPHONE LABORATORIES, INCORPORATED
1624393April 12, 1927Telegraph systemCLOKEY ALLISON A.BELL TELEPHONE LABORATORIES, INCORPORATED
1628666May 17, 1927Electromagnetic deviceHARRISON HENRY C.BELL TELEPHONE LABORATORIES, INCORPORATED
1632130June 14, 1927CondenserARTHUR HADDOCKBELL TELEPHONE LABOR INC
1632104June 14, 1927Transmission circuitsWHITING DONALD F.BELL TELEPHONE LABORATORIES, INCORPORATED
1632051June 14, 1927Telephone systemWHITNEY WILEYBELL TELEPHONE LABORATORIES, INCORPORATED
1632901June 21, 1927Trunking systemJOHNSON HERBERT B.BELL TELEPHONE LABORATORIES, INCORPORATED
1636436July 19, 1927System for wave analysisRETTENMEYER FRANCIS X.BELL TELEPHONE LABORATORIES, INCORPORATED
1639135August 16, 1927Telephone systemJOHNSON HERBERT B. ; EAGON LLOYD LA FAYETTEBELL TELEPHONE LABORATORIES, INCORPORATED
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
1639929August 23, 1927Signaling systemCURTIS AUSTEN M.BELL TELEPHONE LABCRATORIES, INCORPORATED
1641286September 6, 1927Test plugMUELLER JR EMIL CBELL TELEPHONE LABOR INC
1642506September 13, 1927Wave-transmission systemNORTON EDWARD L.BELL TELEPHONE LABORATORIES, INCORPORATED
1642500September 13, 1927Telephone systemKIESEL WALTER C. ; FOWLER CLARENCE B.BELL TELEPHONE LABORATORIES, INCORPORATED
1644060October 4, 1927Telephone systemHOVLAND HENRYBELL TELEPHONE LABORATORIES, INCORPORATED
1645152October 11, 1927Wire-splicing machineMAY DAVID TBELL TELEPHONE LABOR INC
1645823October 18, 1927Sound-producing deviceSHANN OSCAR A ; KUNTZ FRANK ABELL TELEPHONE LABOR INC
1645778October 18, 1927Telephone systemSHIEL JOHN BBELL TELEPHONE LABOR INC
1647738November 1, 1927Insulation of magnetic materialLEGG VICTOR EBELL TELEPHONE LABOR INC
1647737November 1, 1927Magnetic coreLEGG VICTOR EBELL TELEPHONE LABOR INC
1647617November 1, 1927Electron-discharge deviceGRIFFITH THOMAS RBELL TELEPHONE LABOR INC
1647259November 1, 1927Adjustable coilHERBERT-VADERSENBELL TELEPHONE LABOR INC
1647258November 1, 1927Telephone systemULRICH HORACE WBELL TELEPHONE LABOR INC
1647256November 1, 1927Selector-switch circuits for step-by-step systemsSTOKELY RAY LBELL TELEPHONE LABOR INC
1647238November 1, 1927Electron-discharge deviceMANTHORNE WILLIAM HBELL TELEPHONE LABOR INC
1647990November 8, 1927Telephone-exchange systemGOODRUM CHARLES LBELL TELEPHONE LABOR INC
1651021November 29, 1927Voltage-limiting deviceFIELD FRANK EBELL TELEPHONE LABOR INC
1651017November 29, 1927Party-line revertible ringing systemGERALD DEAKINBELL TELEPHONE LABOR INC
1650683November 29, 1927Straightforward trunking systemBASCOM HENRY M ; FOWLER CLARENCE BAMERICAN TELEPHONE & TELEGRAPH
BELL TELEPHONE LABOR INC
1651958December 6, 1927Insulation of finely-divided magnetic materialLOWRY HOMER HBELL TELEPHONE LABOR INC
1651957December 6, 1927Insulation of finely-divided magnetic materialLOWRY HOMER HBELL TELEPHONE LABOR INC
1652491December 13, 1927Electromagnetic relayMILLER DANIEL DBELL TELEPHONE LABOR INC
1652490December 13, 1927Electromagnetic deviceMILLER DANIEL DBELL TELEPHONE LABOR INC
1654085December 27, 1927Voltage-limiting deviceLORANCE GEORGE TBELL TELEPHONE LABOR INC
1653840December 27, 1927Clamping deviceBYL GEORGE NBELL TELEPHONE LABOR INC
1655061January 3, 1928Telephone-exchange systemJORDAN WILLIAM CBELL TELEPHONE LABOR INC
1655059January 3, 1928Selector switchHESS GEORGE KBELL TELEPHONE LABOR INC
1655056January 3, 1928Selector switchGOFF HAROLD WBELL TELEPHONE LABOR INC
1655048January 3, 1928Electrical coil systemDE MONTE ROBERT WBELL TELEPHONE LABOR INC
1654923January 3, 1928Telephone systemDEHN JOSEPH WBELL TELEPHONE LABOR INC
1656737January 17, 1928Insulating material and method of producing the sameKEMP ARCHIE RBELL TELEPHONE LABOR INC
1658315February 7, 1928BatteryWHEELER EDMUND BBELL TELEPHONE LABOR INC
1658210February 7, 1928Electric-wave signaling systemRYAN FRANCIS MBELL TELEPHONE LABOR INC
1658197February 7, 1928Telephone-exchange systemHINRICHSEN EDWARD EBELL TELEPHONE LABOR INC
1658192February 7, 1928Brake for rolling laddersHAMPTON LEON NBELL TELEPHONE LABOR INC
1658843February 14, 1928Modulating systemFRANK GRAYBELL TELEPHONE LABOR INC
1660996February 28, 1928Combined radio loud speaker and phonographHENRY HOLLAND NEWMANBELL TELEPHONE LABOR INC
1660979February 28, 1928Current-control deviceTHAYER WALTER JBELL TELEPHONE LABOR INC
1660975February 28, 1928Telephone systemQUASS RALPH LBELL TELEPHONE LABOR INC
1662085March 13, 1928Regulating systemSTOLLER HUGH MBELL TELEPHONE LABOR INC
1662071March 13, 1928Regulating systemMANDERFELD EMANUEL CBELL TELEPHONE LABOR INC
1662966March 20, 1928Substation circuitFOLEY JOHN WBELL TELEPHONE LABOR INC
1665338April 10, 1928Telephone systemWILEY WHITNEYBELL TELEPHONE LABOR INC
1666195April 17, 1928Duplex telegraph systemCLOKEY ALLISON ABELL TELEPHONE LABOR INC
1667846May 1, 1928Telephone systemFOWLER CLARENCE B.BELL TELEPHONE LABORATORIES, INCORPORATED
1667845May 1, 1928Telephone systemFOWLER CLARENCE B ; LUCEK CHARLES WBELL TELEPHONE LABOR INC
1667830May 1, 1928Telephone systemULRICH HORACE WBELL TELEPHONE LABOR INC
1667804May 1, 1928Means for reenforcing the lock and door of telephone coin collectorsHOYT FREDERICK A ; SHANN OSCAR ABELL TELEPHONE LABOR INC
1668890May 8, 1928Universal adjustable earpiece for audiphonesCURRAN STANLEY T ; MUELLER JR EMIL CBELL TELEPHONE LABOR INC
1668888May 8, 1928Signaling systemBUCKLEY OLIVER EBELL TELEPHONE LABOR INC
1668677May 8, 1928Telephone-exchange systemHARVEY WILLIAM HBELL TELEPHONE LABOR INC
1668656May 8, 1928Relay circuitALFRED PHELPS WALTERBELL TELEPHONES LAB INC
1668654May 8, 1928Direct-current-transforming apparatusMOORE CHARLES BBELL TELEPHONE LABOR INC
1670461May 22, 1928Signaling systemLOCKE GEORGE ABELL TELEPHONE LABOR INC
1671302May 29, 1928Electrooptical transmissionMATHES ROBERT CBELL TELEPHONE LABOR INC
1673124June 12, 1928Signaling systemARTHUR RAYNSFORDBELL TELEPHONE LABOR INC
1673042June 12, 1928Signaling systemCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1673037June 12, 1928Sound measuringBLATTNER DAVID GBELL TELEPHONE LABOR INC
1673034June 12, 1928ConnecterADAMS JR WILLIAM JBELL TELEPHONE LABOR INC
1673031June 12, 1928Wave transmission systemWHITING DONALD FBELL TELEPHONE LABOR INC
1673023June 12, 1928Carrier-wave repeaterRETTENMEYER FRANCIS XBELL TELEPHONE LABOR INC
1673015June 12, 1928Switching systemMURPHY PAUL BBELL TELEPHONE LABOR INC
1673005June 12, 1928CondenserGARGAN JOHN OBELL TELEPHONE LABOR INC
1673828June 19, 1928TelevisionIVES HERBERT EBELL TELEPHONE LABOR INC
1675096June 26, 1928Signaling systemCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1675886July 3, 1928Telephone systemHAGUE ALFRED EBELL TELEPHONE LABOR INC
1675880July 3, 1928Electric-current transmissionCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1675874July 3, 1928Amplifying electrical variationsBAUMANN HAROLD CBELL TELEPHONE LABOR INC
1676627July 10, 1928Method and means for reducing cross talk in carrier-current signaling systemsBLACK HAROLD SBELL TELEPHONE LABOR INC
1678199July 24, 1928Oscillation generatorRETTENMEYER FRANCIS XBELL TELEPHONE LABOR INC
1678190July 24, 1928Telephone systemMORTIMER LOUIS ABELL TELEPHONE LABOR INC
1678185July 24, 1928Telephone systemHARPER ROBERT WBELL TELEPHONE LABOR INC
1678103July 24, 1928Telephone systemCAVERLY HARRY CBELL TELEPHONE LABOR INC
1680550August 14, 1928Signaling systemKERR MARK BBELL TELEPHONE LABOR INC
1681520August 21, 1928Trunk circuitsDAHL JACK FBELL TELEPHONE LABOR INC
1681510August 21, 1928Telephone systemWILLIAMS SAMUEL BBELL TELEPHONE LABOR INC
1681489August 21, 1928Signaling systemLOCKE GEORGE A ; HAGLUND HAKON HBELL TELEPHONE LABOR INC
WESTERN UNION TELEGRAPH CO
1687211October 9, 1928Telephone receiverJONES WARREN CBELL TELEPHONE LABOR INC
1688038October 16, 1928Protective deviceCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1687883October 16, 1928Transmission systemO'NEILL HENRY WBELL TELEPHONE LABOR INC
1689030October 23, 1928Acoustic diaphragmHOLLAND NEWMAN HBELL TELEPHONE LABOR INC
1688993October 23, 1928Telephone systemSMITH EDMUND BBELL TELEPHONE LABOR INC
1689347October 30, 1928Telephone systemKORN FRANKLIN ABELL TELEPHONE LABOR INC
1689343October 30, 1928Telephone systemHINRICHSEN EDWARD EBELL TELEPHONE LABOR INC
1689328October 30, 1928Submarine telegraph systemCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1689318October 30, 1928Repeater circuitsBJORNSON BJORN GBELL TELEPHONE LABOR INC
1690300November 6, 1928Transmission of pictures by electricityHORTON JOSEPH WBELL TELEPHONE LABOR INC
1690280November 6, 1928Electrical testingCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1690234November 6, 1928Trunking circuit to centralized operator's positionLAMBERTY FREDERICK RBELL TELEPHONE LABOR INC
1690210November 6, 1928Telephone systemSTOKELY RAY LBELL TELEPHONE LABOR INC
1690201November 6, 1928Signaling conductorMOUGEY WILBUR EBELL TELEPHONE LABOR INC
1691098November 13, 1928Means for coupling circuits of different impedance characteristicsWHITING DONALD FBELL TELEPHONE LABOR INC
1695057December 11, 1928Telephone systemMURPHY PAUL BBELL TELEPHONE LABOR INC
1695048December 11, 1928Picture transmissionIVES HERBERT EBELL TELEPHONE LABOR INC
1695041December 11, 1928Production of magnetic dust coresELMEN GUSTAF WBELL TELEPHONE LABOR INC
1695040December 11, 1928Multiplex-telegraph systemCLOKEY ALLISON ABELL TELEPHONE LABOR INC
1695039December 11, 1928Electric wave signaling systemCLEMENT LEWIS MBELL TELEPHONE LABOR INC
1695035December 11, 1928Electric regulatorSTCLLER HUGH MBELL TELEPHONE LABOR INC
1696274December 25, 1928Substation circuitsJOHNSON KENNETH SBELL TELEPHONE LABOR INC
1696271December 25, 1928Call-charging telephone-exchange systemHAGUE ALFRED EBELL TELEPHONE LABOR INC
1696267December 25, 1928Telephone systemDUNHAM BERT GBELL TELEPHONE LABOR INC
1696265December 25, 1928Acoustic deviceBUCKLEY OLIVER EBELL TELEPHONE LABOR INC
1696261December 25, 1928Transmission systemWILLIAMS SAMUEL BBELL TELEPHONE LABOR INC
1696248December 25, 1928Circuits for synchronous motorsMORTON EDMUND RBELL TELEPHONE LABOR INC
1700536January 29, 1929Frequency translating circuitsKEITH CLYDE RBELL TELEPHONE LABOR INC
1700530January 29, 1929Acoustic diaphragmHOLLAND NEWMAN HBELL TELEPHONE LABOR INC
1700476January 29, 1929Submarine signaling cableGILBERT JOHN JBELL TELEPHONE LABOR INC
1700470January 29, 1929Electromagnetic relayCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1700467January 29, 1929Telephone-exchange systemCLARK EDGAR HBELL TELEPHONE LABOR INC
1700460January 29, 1929Metallurgical processWHITE JOHN HBELL TELEPHONE LABOR INC
1700458January 29, 1929Party-line telephone systemWALLER LEE RBELL TELEPHONE LABOR INC
1700457January 29, 1929Acoustic deviceTHURAS ALBERT LBELL TELEPHONE LABOR INC
1700452January 29, 1929Electron-discharge deviceRONCI VICTOR LBELL TELEPHONE LABOR INC
1701100February 5, 1929High-speed telegraph repeater employing vibrating relaysCUMMINGS GEORGE CBELL TELEPHONE LABOR INC
1700833February 5, 1929Sound-recording systemENGEL THEODORE JBELL TELEPHONE LABOR INC
1702568February 19, 1929Constant frequency wave sourceMARRISON WARREN ABELL TELEPHONE LABOR INC
1705993March 19, 1929Voltage-limiting deviceOSWALD ARTHUR ABELL TELEPHONE LABOR INC
1705913March 19, 1929High-frequency submarine cableGILBERT JOHN JBELL TELEPHONE LABOR INC
1705906March 19, 1929Telephone systemDEHN JOSEPH WBELL TELEPHONE LABOR INC
1705903March 19, 1929Power line signalingDAVEE LAWRENCE WBELL TELEPHONE LABOR INC
1705891March 19, 1929Power line signalingARNOLD HENRY BBELL TELEPHONE LABOR INC
1707545April 2, 1929Acoustic deviceWENTE EDWARD CBELL TELEPHONE LABOR INC
1707544April 2, 1929Electrodynamic deviceTHURAS ALBERT LBELL TELEPHONE LABOR INC
1707486April 2, 1929Electrooptical transmissionKISHPAUGH ARTHUR WBELL TELEPHONE LABOR INC
1709554April 16, 1929Voice-frequency calling systemBLACK HAROLD SBELL TELEPHONE LABOR INC
1708983April 16, 1929Telephone systemEDWARD VROOM ; ENTZ FERDINAND SBELL TELEPHONE LABOR INC
1708960April 16, 1929Telephone systemULRICH HORACE WBELL TELEPHONE LABOR INC
1708955April 16, 1929Relay commutatorPRUDEN HAROLD MBELL TELEPHONE LABOR INC
1708946April 16, 1929Telephone-exchange systemHENRY HOVLANDBELL TELEPHONE LABOR INC
1708939April 16, 1929Electron-discharge deviceCRAWFORD ALLEN IBELL TELEPHONE LABOR INC
1708936April 16, 1929Magnetic materialCIOFFI PAUL PBELL TELEPHONE LABOR INC
1708935April 16, 1929Coil and transformerCHRISTOPHER ARTHUR JBELL TELEPHONE LABOR INC
1708934April 16, 1929Electric signalingBURTON EVERETT TBELL TELEPHONE LABOR INC
1708933April 16, 1929Signaling systemBEACH WILLIAM CBELL TELEPHONE LABOR INC
1711690May 7, 1929Phonograph-record-recording machineRICHARD CHARLES DBELL TELEPHONE LABOR INC
1711689May 7, 1929Rotary mercury interrupterPIERCE PAUL H ; MEANS WINTHROP JBELL TELEPHONE LABOR INC
1711687May 7, 1929Telephone calling dialMILLER VICTOR FBELL TELEPHONE LABOR INC
1711684May 7, 1929Method of making half tonesIVES HERBERT EBELL TELEPHONE LABOR INC
1711682May 7, 1929Telephone-exchange systemHENRY HOVLANDBELL TELEPHONE LABOR INC
1711673May 7, 1929Vacuum-tube baseCRAWFORD ALLEN I ; SAMPLE RALPH MBELL TELEPHONE LABOR INC
1711666May 7, 1929Sound reproducing and recording deviceWHITTINGTON ADAMS EDGARBELL TELEPHONE LABOR INC
1711664May 7, 1929Transmission systemWILLIAMS SAMUEL BBELL TELEPHONE LABOR INC
1711661May 7, 1929Regulator systemSTOLLER HUGH MBELL TELEPHONE LABOR INC
1711651May 7, 1929Signaling systemPRUDEN HAROLD MBELL TELEPHONE LABOR INC
1714683May 28, 1929Electrical insulationLOWRY HOMER HBELL TELEPHONE LABOR INC
1715713June 4, 1929Treatment of magnetic materialsLEGG VICTOR EBELL TELEPHONE LABOR INC
1715648June 4, 1929Magnetic materialELMEN GUSTAF WBELL TELEPHONE LABOR INC
1715645June 4, 1929Electrical signalingDICKIESON ALTON CBELL TELEPHONE LABOR INC
1715543June 4, 1929Magnetic coreELMEN GUSTAF WBELL TELEPHONE LABOR INC
1715542June 4, 1929Electrical coils and system employing such coilsELMEN GUSTAF WBELL TELEPHONE LABOR INC
1717158June 11, 1929Sound reproducerJONES WARREN CBELL TELEPHONE LABOR INC
1717146June 11, 1929Sound reproducerCROUCH JAMES LBELL TELEPHONE LABOR INC
1717143June 11, 1929Telephone systemCAHILL HAROLD DBELL TELEPHONE LABOR INC
1717095June 11, 1929Potential-limiting deviceCLOKEY ALLISON ABELL TELEPHONE LABOR INC
1717083June 11, 1929Carrier signal systemARNOLD HENRY BBELL TELEPHONE LABOR INC
1717079June 11, 1929Coin-collection apparatusWHEELER CLYDE HBELL TELEPHONE LABOR INC
1717074June 11, 1929Telephone-exchange maintenance systemTAPLIN CARLETON V. ; ALLEN LOUIS M. ; BERTELS ARNOLD S.THE AMERICAN TELEPHONE AND TELEGRAPH COMPANY
BELL TELEPHONE LABORATORIES, INCORPORATED
1717062June 11, 1929Electric signalingPHELPS WALTER ABELL TELEPHONE LABOR INC
1717055June 11, 1929Public-address systemMELHUISH LAWRENCE EBELL TELEPHONE LABOR INC
1717011June 11, 1929Reactance deviceDE COUTOULY GUSTAVE CHARLESBELL TELEPHONE LABOR INC
1717782June 18, 1929Electrooptical transmissionIVES HERBERT E ; HORTON JOSEPH WBELL TELEPHONE LABOR INC
1717781June 18, 1929Picture-transmission systemIVES HERBERT EBELL TELEPHONE LABOR INC
1719499July 2, 1929Telephone systemBOWNE LANGFORD JBELL TELEPHONE LABOR INC
1719495July 2, 1929Oscillation generatorWIESE FLOYD MBELL TELEPHONE LABOR INC
1719494July 2, 1929Telephone-exchange systemULRICH HORACE W ; PRINCE WILLIAM BBELL TELEPHONE LABOR INC
1719492July 2, 1929Regulator systemSTOLLER HUGH MBELL TELEPHONE LABOR INC
1719491July 2, 1929Electric regulatorSTOLLER HUGH M ; MORTON EDMUND RBELL TELEPHONE LABOR INC
1719489July 2, 1929Telegraph printerSHANGLE AMOS HBELL TELEPHONE LABOR INC
1719485July 2, 1929Power-line carrier wave signaling systemPEASE REGINALD MBELL TELEPHONE LABOR INC
1719479July 2, 1929Composite conductorLEGG VICTOR EBELL TELEPHONE LABOR INC
1719477July 2, 1929Telegraph systemKNOOP WILLIAM ABELL TELEPHONE LABOR INC
1719474July 2, 1929Current-controlling deviceJUTSON ROBERT PBELL TELEPHONE LABOR INC
1719472July 2, 1929Acoustic diaphragmHOLLAND NEWMAN HBELL TELEPHONE LABOR INC
1719091July 2, 1929Telephone-exchange systemSTOKELY RAY LBELL TELEPHONE LABOR INC
1722064July 23, 1929Telephone-exchange systemSTEARN FRANKLIN A ; CLARK EDGAR HBELL TELEPHONE LABOR INC
1722047July 23, 1929System for signalingHEISING RAYMOND ABELL TELEPHONE LABOR INC
1722045July 23, 1929Transmission systemFRY JACOB RBELL TELEPHONE LABOR INC
1722039July 23, 1929Signal-operated repeater circuitsDUDLEY HOMER WBELL TELEPHONE LABOR INC
1722033July 23, 1929Telephone-exchange systemBRAGG HERBERT EBELL TELEPHONE LABOR INC
1722027July 23, 1929Acoustic deviceWENTE EDWARD CBELL TELEPHONE LABOR INC
1722016July 23, 1929Electrical conductor and method of making sameRONCI VICTOR LBELL TELEPHONE LABOR INC
1722805July 30, 1929Sound radiatorLANE CLARENCE EBELL TELEPHONE LABOR INC
1722751July 30, 1929Optical inspection systemJONES REGINALD LBELL TELEPHONE LABOR INC
1722347July 30, 1929Acoustic apparatusWENTE EDWARD CBELL TELEPHONE LABOR INC
1725566August 20, 1929Secret communication systemCHESNUT ROY WBELL TELEPHONE LABOR INC
1725377August 20, 1929Direct-current-supply systemSIEGMUND HUMPHREYS OBELL TELEPHONE LABOR INC
1725032August 20, 1929Secret communicating systemWEIS JR CHARLES LBELL TELEPHONE LABOR INC
1725022August 20, 1929AlarmSTACY LELAND J ; KROM MYRON EBELL TELEPHONE LABOR INC
1724994August 20, 1929Duplex telegraph system for loaded cablesCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1724989August 20, 1929Contactor drum for telephone-central-office equipmentBARBER CHARLES CBELL TELEPHONE LABOR INC
1724972August 20, 1929Glass-working machinePAUL SCHWERIN ; PFEIFFER JOHN GBELL TELEPHONE LABOR INC
1724962August 20, 1929Electrical testing systemPEOPLES ROBERT EBELL TELEPHONE LABOR INC
1724924August 20, 1929Telephone systemGRAHAM FRANK HBELL TELEPHONE LABOR INC
1724923August 20, 1929Submarine-telegraph systemGILBERT JOHN JBELL TELEPHONE LABOR INC
1724905August 20, 1929Telephone systemCAVERLY HARRY C.BELL TELEPHONE LABORATORIES, INCORPORATED
1726105August 27, 1929Acoustic deviceHARRISON HENRY CBELL TELEPHONE LABOR INC
1728122September 10, 1929Television systemHORTON JOSEPH WBELL TELEPHONE LABOR INC
1727550September 10, 1929Composite conductorLEGG VICTOR EBELL TELEPHONE LABOR INC
1728311September 17, 1929Electrical converting and measuring systemTAYLOR ALFRED TBELL TELEPHONE LABOR INC
1728304September 17, 1929Film-drive mechanismHARRY PFANNENSTIEHLBELL TELEPHONE LABOR INC
1729806October 1, 1929Electrodynamic deviceTHURAS ALBERT LBELL TELEPHONE LABOR INC
1730981October 8, 1929Telephone systemMURPHY PAUL BBELL TELEPHONE LABOR INC
1730614October 8, 1929Synchronous vibratory relay systemKNOOP WILLIAM ABELL TELEPHONE LABOR INC
1730424October 8, 1929Magnetic ball or roller bearingHARRISON HENRY C.BELL TELEPHONE LABORATORIES, INCORPORATED
1731656October 15, 1929Repeater circuitsFLANDERS PAUL BBELL TELEPHONE LABOR INC
1733617October 29, 1929Signaling systemMEISSNER CHARLES RBELL TELEPHONE LABOR INC
1733614October 29, 1929Subharmonic frequency producerMARRISON WARREN A.BELL TELEPHONE LABORATORIES, INCORPORATED
1733608October 29, 1929Phonograph needleKNOX WILLIAM G ; RUSSELL ALEXANDER GBELL TELEPHONE LABOR INC
1733607October 29, 1929Combined recorder and reproducerKELLER ARTHUR CBELL TELEPHONE LABOR INC
1733605October 29, 1929Tactual interpretation of vibrationsJONES WARREN CBELL TELEPHONE LABOR INC
1733602October 29, 1929Telephone systemJOHNSON HERBERT BBELL TELEPHONE LABOR INC
1733596October 29, 1929Acoustic deviceHARRISON HENRY C.BELL TELEPHONE LABORATORIES, INCORPORATED
1733592October 29, 1929Process of manufacture of magnetic coresGIVEN FREDERICK JBELL TELEPHONE LABOR INC
1733591October 29, 1929Electric-circuit connecterGILSON ALBERT F FBELL TELEPHONE LABOR INC
1733580October 29, 1929Telephone systemCOLLIS RAYMOND EBELL TELEPHONE LABOR INC
1733569October 29, 1929Telephone-exchange systemWILLIFORD OSCAR HBELL TELEPHONE LABOR INC
1733568October 29, 1929Telephone systemWILBUR RAY SBELL TELEPHONE LABOR INC
1733557October 29, 1929Film-retaining rollerHARRY PFANNENSTIEHLBELL TELEPHONE LABOR INC
1733556October 29, 1929Carrier-wave transmissionEUGENE PETERSONBELL TELEPHONE LABOR INC
1733554October 29, 1929Magnetic deviceNORTON EDWARD LBELL TELEPHONE LABOR INC
1733553October 29, 1929Power-line carrier-current systemNEBEL CHARLES NBELL TELEPHONE LABOR INC
1734624November 5, 1929Piston diaphragm having tangential corrugationsHARRISON HENRY CBELL TELEPHONE LABOR INC
1738327December 3, 1929Vibration deviceSMYTHE EDWIN H ; LANE CLARENCE EBELL TELEPHONE LABOR INC
1738322December 3, 1929Acoustic deviceSCHLENKER VESPER ABELL TELEPHONE LABOR INC
1738307December 3, 1929Metallic elementMCKEEHAN LOUIS WBELL TELEPHONE LABOR INC
1738302December 3, 1929Telephone systemKRECEK JOSEPH ABELL TELEPHONE LABOR INC
1738299December 3, 1929Intermittently-operated signaling deviceKILLE LINDLEY ABELL TELEPHONE LABOR INC
1738298December 3, 1929Telephone systemJOHNSON LEWIS HBELL TELEPHONE LABOR INC
1738294December 3, 1929Telephone systemGOODERHAM JOHN WBELL TELEPHONE LABOR INC
1738293December 3, 1929Electrical controlling deviceGOODERHAM JOHN WBELL TELEPHONE LABOR INC
1738292December 3, 1929Submarine duplex telegraph systemGILBERT JOHN JBELL TELEPHONE LABOR INC
1738290December 3, 1929Telephone-exchange systemFOWLER CLARENCE BBELL TELEPHONE LABOR INC
1738247December 3, 1929Current-controlling systemPHILIP HUSTABELL TELEPHONE LABOR INC
1738245December 3, 1929Telephone systemHINRICHSEN EDWARD EBELL TELEPHONE LABOR INC
1738007December 3, 1929TelevisionIVES HERBERT EBELL TELEPHONE LABOR INC
1739068December 10, 1929Method of producing materials in finely-divided formHARRIS JAMES EBELL TELEPHONE LABOR INC
1739052December 10, 1929Production of finely-divided metallic materialsWHITE JOHN HBELL TELEPHONE LABOR INC
1739752December 17, 1929Magnetic material and applianceELMEN GUSTAF WBELL TELEPHONE LABOR INC
1739699December 17, 1929Electrical transmission circuitsHORACE WHITTLEBELL TELEPHONE LABOR INC
1739668December 17, 1929Transmission systemGREEN CHARLES WBELL TELEPHONE LABOR INC
1741767December 31, 1929Carrier-current signaling systemGREEN CHARLES WBELL TELEPHONE LABOR INC
1742930January 7, 1930Telephone systemPAINE ROBERT CBELL TELEPHONE LABOR INC
1742928January 7, 1930Telephone trunk circuitsNICOLL ROBERT I DBELL TELEPHONE LABOR INC
1742927January 7, 1930Telephone-exchange systemNICOLL ROBERT I D ; DAVIS RICHARD C ; VON NOSTITZ ERICHBELL TELEPHONE LABOR INC
AMERICAN TELEPHONE & TELEGRAPH
1742920January 7, 1930Telephone-exchange systemMATTHIES WILLIAM HBELL TELEPHONE LABOR INC
1742916January 7, 1930Telephone-exchange systemIRVINE FRANK SBELL TELEPHONE LABOR INC
1742899January 7, 1930Synchronous telegraphyCLOKEY ALLISON ABELL TELEPHONE LABOR INC
1743711January 14, 1930Supervisory systemFIELD JOSEPH CBELL TELEPHONE LABOR INC
1743710January 14, 1930Secrecy system for signalingENGLUND CARL R ; LLEWFLLYN FREDERICK BBELL TELEPHONE LABOR INC
1743708January 14, 1930Telephone systemCOLLIS RAYMOND EBELL TELEPHONE LABOR INC
1743478January 14, 1930Magnetic devicePRATT EDWARD JBELL TELEPHONE LABOR INC
1743470January 14, 1930Magnetic deviceMEAD EDWARD DBELL TELEPHONE LABOR INC
1743456January 14, 1930Sound recordingKEITH CLYDE RBELL TELEPHONE LABOR INC
1743453January 14, 1930Electromagnetic deviceHILLHOUSE JOHN T EBELL TELEPHONE LABOR INC
1743429January 14, 1930Telephone-exchange systemCLARK EDGAR HBELL TELEPHONE LABOR INC
1743415January 14, 1930Telephone-exchange systemWILBUR RAY SBELL TELEPHONE LABOR INC
1744047January 21, 1930Combined recorder and reproducerKELLER ARTHUR CBELL TELEPHONE LABOR INC
1745756February 4, 1930Electrical picture-transmission receiving systemFRANK GRAYBELL TELEPHONE LABOR INC
1745680February 4, 1930Continuously-loaded telephone or telegraph cableKEMP ARCHIE RBELL TELEPHONE LABOR INC
1745612February 4, 1930Nonmagnetic materialELMEN GUSTAF WBELL TELEPHONE LABOR INC
1746808February 11, 1930Power-line signalingWOLFE WALLACE VBELL TELEPHONE LABOR INC
1746803February 11, 1930Balanced radio receiving systemSTEVENSON GEORGE HBELL TELEPHONE LABOR INC
1746800February 11, 1930Telephone receiverSEACORD KENNETH PBELL TELEPHONE LABOR INC
1746788February 11, 1930Piezo-electric deviceMARRISON WARREN ABELL TELEPHONE LABOR INC
1746730February 11, 1930Reproducing apparatusJONES WARREN CBELL TELEPHONE LABOR INC
1746729February 11, 1930Electrooptical systemIVES HERBERT EBELL TELEPHONE LABOR INC
1747866February 18, 1930Sound recording and reproducing machineELMER LLOYD ABELL TELEPHONE LABOR INC
1747863February 18, 1930Electrical signalingDICKIESON ALTON CBELL TELEPHONE LABOR INC
1747854February 18, 1930Magnetic structureBOZORTH RICHARD MBELL TELEPHONE LABOR INC
1747849February 18, 1930Telephone systemSTRICKLER WALTER BBELL TELEPHONE LABOR INC
1747847February 18, 1930Method of manufacturing acoustic radiatorsSCHLENKER VESPER ABELL TELEPHONE LABOR INC
1747841February 18, 1930Substation apparatusPETERSON ARTHUR EBELL TELEPHONE LABOR INC
1747835February 18, 1930Two-way signaling systemMATHES ROBERT CBELL TELEPHONE LABOR INC
1747833February 18, 1930Telephone-switchboard systemKING GERALD VBELL TELEPHONE LABOR INC
1747830February 18, 1930Acoustic hornHARRISON HENRY CBELL TELEPHONE LABOR INC
1747829February 18, 1930Electrical reproducerHARRISON HENRY CBELL TELEPHONE LABOR INC
1747821February 18, 1930Supervisory systemFIELD JOSEPH C.BELL TELEPHONE LABORATORIES, INCORPORATED
1747248February 18, 1930Synchronizing systemKNOOP WILLIAM ABELL TELEPHONE LABOR INC
1747244February 18, 1930Coin-collection apparatusHOYT FREDERICK ABELL TELEPHONE LABOR INC
1747241February 18, 1930Telephone systemHINRICHSEN EDWARD EBELL TELEPHONE LABOR INC
1747233February 18, 1930Tuning dialGARGAN JOHN OBELL TELEPHONE LABOR INC
1747224February 18, 1930Telephone-exchange systemCARPENTER WARREN WBELL TELEPHONE LABOR INC
1747219February 18, 1930Telephone systemBOWNE LANGFORD J ; KOECHLING CHARLES DBELL TELEPHONE LABOR INC
1747169February 18, 1930Connecter-switch circuitsHENRY HOVLANDBELL TELEPHONE LABOR INC
1747163February 18, 1930Carrier-system-testing method and circuitDICKIESON ALTON CBELL TELEPHONE LABOR INC
1748239February 25, 1930Telephone systemMATTHIES WILLIAM HBELL TELEPHONE LABOR INC
1751263March 18, 1930Electrical switching systemORFEO CESAREOBELL TELEPHONE LABOR INC
1751259March 18, 1930Reating loaded submarine cablesWENTZ JESSE FBELL TELEPHONE LABOREATORIES I
1751207March 18, 1930Telephone trunk circuitJOHNSON HERBERT BBELL TELEPHONE LABOR INC
1752046March 25, 1930Electric coupling circuitsHORACE WHITTLEBELL TELEPHONE LABOR INC
1752550April 1, 1930Telephone systemDEHN JOSEPH WBELL TELEPHONE LABOR INC
1752486April 1, 1930Magnetic deviceHARTLEY RALPH V LBELL TELEPHONE LABOR INC
1752438April 1, 1930Telephone systemKORN FRANKLIN ABELL TELEPHONE LABOR INC
1752436April 1, 1930Telegraph repeating systemKINKEAD FULLERTON SBELL TELEPHONE LABOR INC
1752429April 1, 1930Telephone setFOWLER CLARENCE BBELL TELEPHONE LABOR INC
1752413April 1, 1930Signaling cableBUCKLEY OLIVER EBELL TELEPHONE LABOR INC
1753353April 8, 1930Electrical system for secret transmissionSTEINBERG JOHN CBELL TELEPHONE LABOR INC
1753348April 8, 1930Monitoring systemNEWSOM JAMES BBELL TELEPHONE LABOR INC
1753345April 8, 1930Timing circuitKNOOP WILLIAM ABELL TELEPHONE LABOR INC
1753338April 8, 1930Telephone-exchange systemHAGUE ALFRED E ; PETERSON GEORGE HBELL TELEPHONE LABOR INC
1753337April 8, 1930Adjustable inductance coilGIVEN FREDERICK JBELL TELEPHONE LABOR INC
1753336April 8, 1930Duplex telegraph system for loaded cablesGILBERT JOHN JBELL TELEPHONE LABOR INC
1753334April 8, 1930Telephone systemCURLEY THOMAS VBELL TELEPHONE LABOR INC
1753331April 8, 1930Constant-speed driveCLOKEY ALLISON ABELL TELEPHONE LABOR INC
1753330April 8, 1930Metering deviceBRAGG HERBERT EBELL TELEPHONE LABOR INC
1753329April 8, 1930Electric signaling systemBLACK HAROLD SBELL TELEPHONE LABOR INC
1753325April 8, 1930Retardation-coil systemHORACE WHITTLEBELL TELEPHONE LABOR INC
1753321April 8, 1930Telephone-exchange systemSTOKELY RAY LBELL TELEPHONE LABOR INC
1756705April 29, 1930Voice screenSMITH JR WALTER F ; CRABTREE THEODORE HBELL TELEPHONE LABOR INC
1756573April 29, 1930Regulator systemSTOLLER HUGH M ; PORTER GEORGE CBELL TELEPHONE LABOR INC
1756274April 29, 1930Signaling conductorANDEREGG GUSTAVUS ABELL TELEPHONE LABOR INC
1757736May 6, 1930Lubricating devicePRITCHARD WILLIAM T.BELL TELEPHONE LABORATORIES, INCORPORATED
1757727May 6, 1930Electric control deviceMARRISON WARREN ABELL TELEPHONE LABOR INC
1757712May 6, 1930Acoustic deviceHARRISON HENRY CBELL TELEPHONE LABOR INC
1757708May 6, 1930Telephone-exchange systemEVERETT SAMUEL HBELL TELEPHONE LABOR INC
1757704May 6, 1930Contact-drive vibratory forkCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1757703May 6, 1930Electrical contact deviceCURTIS AUSTEN MBELL TELEPHONE LABOR INC
1757465May 6, 1930Acoustic deviceMOORE CHARLES RBELL TELEPHONE LABOR INC
1757464May 6, 1930Coin-collection apparatusMELICK JOHN MBELL TELEPHONE LABOR INC
1757178May 6, 1930Magnetic materialELMEN GUSTAF WBELL TELEPHONE LABOR INC
1759623May 20, 1930Signaling systemMATHES ROBERT CBELL TELEPHONE LABOR INC
1759612May 20, 1930Method of producing magnetic bodiesGIVEN FREDERICK J ; GREENIDGE RALPH M C ; WEEKS JR JOHN RBELL TELEPHONE LABOR INC
1759610May 20, 1930Radio receiving setFISHER GEORGE HBELL TELEPHONE LABOR INC
1759604May 20, 1930Indicating deviceBJORNSON BJORN GBELL TELEPHONE LABOR INC
1759504May 20, 1930Electrooptical transmissionFRANK GRAYBELL TELEPHONE LABOR INC
1759332May 20, 1930Wave transmission circuitHORACE WHITTLE ; GRIMLEY DONALD GBELL TELEPHONE LABOR INC
1760159May 27, 1930Electrooptical image productionMATHES ROBERT CBELL TELEPHONE LABOR INC
1763203June 10, 1930Remote-control systemVIETH WILLIAM FBELL TELEPHONE LABOR INC
1763194June 10, 1930Communication systemSIVIAN LEON JBELL TELEPHONE LABOR INC
1763172June 10, 1930Electro-polarized relayMILLER OHMER R ; MEAD EDWARD DBELL TELEPHONE LABOR INC
1763169June 10, 1930Sound recordingMATHES ROBERT CBELL TELEPHONE LABOR INC
1763161June 10, 1930Telephone systemKOECHLING CHARLES D ; KING GERALD VBELL TELEPHONE LABOR INC
1763157June 10, 1930Telephone systemKING GERALD VBELL TELEPHONE LABOR INC
1763060June 10, 1930Telephone-exchange equipmentMEYER DELBERT CBELL TELEPHONE LABOR INC
1763057June 10, 1930Regulator systemKROM MYRON EBELL TELEPHONE LABOR INC
1763043June 10, 1930Loading of conductorsGILBERT JOHN JBELL TELEPHONE LABOR INC
1763036June 10, 1930Trunking systemENTZ FERDINAND SBELL TELEPHONE LABOR INC
1763017June 10, 1930Regulator systemSTOLLER HUGH MBELL TELEPHONE LABOR INC
1763015June 10, 1930Operation of electric space-discharge devicesSTEVENSON GEORGE HBELL TELEPHONE LABOR INC
1763014June 10, 1930Regulator systemSTACY LELAND J ; KROM MYRON EBELL TELEPHONE LABOR INC
1763008June 10, 1930Electromagnetic devicePRIESSMAN NEIL YBELL TELEPHONE LABOR INC
1763006June 10, 1930Telephone-exchange equipmentMURPHY PAUL GBELL TELEPHONE LABOR INC
1763003June 10, 1930Electromagnetic deviceMEAD EDWARD DBELL TELEPHONE LABOR INC
1762999June 10, 1930Regulator systemMANDERFELD EMANUEL CBELL TELEPHONE LABOR INC
1762996June 10, 1930Loading of signaling conductorsLEGG VICTOR EBELL TELEPHONE LABOR INC
1762991June 10, 1930Electromagnetic reproducer or recorderJONES WARREN CBELL TELEPHONE LABOR INC
1762986June 10, 1930Telephone systemHINRICHSEN EDWARD EBELL TELEPHONE LABOR INC
1762984June 10, 1930Secret-communicating systemHEISING RAYMOND ABELL TELEPHONE LABOR INC
1762981June 10, 1930Acoustic deviceHARTLEY RALPH V LBELL TELEPHONE LABOR INC
1762973June 10, 1930Alarm systemAUGUSTUS FREDERICK HALSEYBELL TELEPHONE LABOR INC
1762971June 10, 1930Remote-control power systemFIELD JOSEPH CBELL TELEPHONE LABOR INC
1762968June 10, 1930Composite conductorFARNSWORTH FRANK FBELL TELEPHONE LABOR INC
1762956June 10, 1930Signaling conductorBUCKLEY OLIVER EBELL TELEPHONE LABOR INC
1762953June 10, 1930Signaling systemBLACK HAROLD SBELL TELEPHONE LABOR INC
1762941June 10, 1930Paper-insulated conductorWOOD ERNEST BBELL TELEPHONE LABOR INC
1762777June 10, 1930Transmission systemGOODRUM CHARLES LBELL TELEPHONE LABOR INC
1762775June 10, 1930Inductance deviceGANZ ALBERT GBELL TELEPHONE LABOR INC
1762774June 10, 1930Electromagnetic deviceFRY JACOB RBELL TELEPHONE LABOR INC
1762768June 10, 1930Transmission systemDICKIESON ALTON CBELL TELEPHONE LABOR INC
1762763June 10, 1930Telephone systemCOLLIS RAYMOND EBELL TELEPHONE LABOR INC
1762759June 10, 1930Volume-control systemBURKHOLDER JR JOHN CBELL TELEPHONE LABOR INC
1762755June 10, 1930Method and means for reducing crosstalk in carrier-current signaling systemsBLACK HAROLD SBELL TELEPHONE LABOR INC
1762746June 10, 1930Substation locking apparatusSHANN OSCAR ABELL TELEPHONE LABOR INC
1762745June 10, 1930Substation apparatusSHANN OSCAR ABELL TELEPHONE LABOR INC
1762744June 10, 1930Retardation coil for composite setsSCHWARTZ ERNEST L ; WILLIAMS JR ALBERT JBELL TELEPHONE LABOR INC
1762737June 10, 1930System employing space-discharge deviceEUGENE PETERSONBELL TELEPHONE LABOR INC
1762731June 10, 1930Magnetic deviceMEAD EDWARD DBELL TELEPHONE LABOR INC
1762730June 10, 1930Heat treatment of magnetic materialsMCKEEHAN LOUIS WBELL TELEPHONE LABOR INC
1762727June 10, 1930Volume-control systemMATHES ROBERT CBELL TELEPHONE LABOR INC
1762725June 10, 1930Method of and means for indicating synchronismMARRISON WARREN ABELL TELEPHONE LABOR INC
1762139June 10, 1930Signaling systemBENNETT ARTHUR F ; MITCHELL CLIFFORD EBELL TELEPHONE LABOR INC
1763909June 17, 1930Speed regulatorSTOLLER HUGH M ; MORTON EDMUND RBELL TELEPHONE LABOR INC
1763893June 17, 1930Telephone systemKRECEK JOSEPH ABELL TELEPHONE LABOR INC
1763891June 17, 1930Sound recordingJONES WARREN CBELL TELEPHONE LABOR INC
1763880June 17, 1930Signaling systemBURTON EVERETT TBELL TELEPHONE LABOR INC
1768288June 24, 1930System for converting light energy into electrical energy and vice versaFRANKLIN MOHRBELL TELEPHONE LABOR INC
1768286June 24, 1930RadioreceiverNATHANIEL BISHOPBELL TELEPHONE LABOR INC
1768283June 24, 1930Control systemBELL JOHN HBELL TELEPHONE LABOR INC
1768273June 24, 1930Sound recordingTERRY ROY VBELL TELEPHONE LABOR INC
1768262June 24, 1930Phase measuring system and methodMARRISON WARREN ABELL TELEPHONE LABOR INC
1768251June 24, 1930Electric wave transmission deviceHEISING RAYMOND ABELL TELEPHONE LABOR INC
1768240June 24, 1930Loading-coil caseFALK ARTHUR HBELL TELEPHONE LABOR INC
1767964June 24, 1930Vacuum-tube circuitsMETER COUSINS VANBELL TELEPHONE LABOR INC
1767962June 24, 1930Automatic telephone-exchange systemCLARK EDGAR H ; CARPENTER WARREN WBELL TELEPHONE LABOR INC
1767961June 24, 1930Automatic telephone-exchange systemCLARK EDGAR H ; CARPENTER WARREN WBELL TELEPHONE LABOR INC
1767960June 24, 1930Automatic telephone exchangeCLARK EDGAR H ; CARPENTER WARREN WBELL TELEPHONE LABOR INC
1767959June 24, 1930Automatic telephone-exchange systemCLARK EDGAR H ; CARPENTER WARREN WBELL TELEPHONE LABOR INC
1767929June 24, 1930Telephone systemJOHNSON HERBERT BBELL TELEPHONE LABOR INC
1766473June 24, 1930Electrodynamic deviceWENTE EDWARD CBELL TELEPHONE LABOR INC
1765523June 24, 1930Signal-transmission systemCECCARINI OLINDO OBELL TELEPHONE LABOR INC
1765396June 24, 1930Indicating systemBETTS PHILANDER HBELL TELEPHONE LABOR INC
1769920July 8, 1930Electrooptical transmission systemFRANK GRAYBELL TELEPHONE LABOR INC
1769919July 8, 1930Electrooptical transmission systemFRANK GRAY ; HEFELE JOHN RBELL TELEPHONE LABOR INC
1769918July 8, 1930Electrooptical transmission systemFRANK GRAY ; HEFELE JOHN RBELL TELEPHONE LABOR INC
1772558August 12, 1930Loading systemSHEA TIMOTHY EBELL TELEPHONE LABOR INC
1773938August 26, 1930Method of manufacturing loaded conductorsBISHOP WALTER MBELL TELEPHONE LABOR INC
1773910August 26, 1930Sound radiatorLANE CLARENCE EBELL TELEPHONE LABOR INC
1775241September 9, 1930Electrooptical systemHORTON JOSEPH WBELL TELEPHONE LABOR INC
1777118September 30, 1930Acoustic deviceHARRISON HENRY CBELL TELEPHONE LABOR INC
1778407October 14, 1930Selective switchWALTERS JAMES N ; CLARK EDGAR HAMERICAN TELEPHONE & TELEGRAPH
BELL TELEPHONE LABOR INC
1778401October 14, 1930RelayPRATT EDWARD JBELL TELEPHONE LABOR INC
1778386October 14, 1930Sound reproducerHARRISON HENRY CBELL TELEPHONE LABOR INC
1778378October 14, 1930Telephone systemBUTZ EDWARD DBELL TELEPHONE LABOR INC
1778377October 14, 1930Telegraph repeating deviceBURTON EVERETT T.BELL TELEPHONE LABORATORIES, INCORPORATED
1778319October 14, 1930Telephone metering systemHAGUE ALFRED EBELL TELEPHONE LABOR INC
1778309October 14, 1930Telephone metering systemCARPENTER WARREN W ; JOHNSON LEWIS HBELL TELEPHONE LABOR INC
1778035October 14, 1930Harmonic-noise-suppression deviceMASON WARREN PBELL TELEPHONE LABOR INC
1779382October 21, 1930Negative impedance circuitMATHES ROBERT CBELL TELEPHONE LABOR INC
1779380October 21, 1930Negative impedance circuitsDUDLEY HOMER WBELL TELEPHONE LABOR INC
1779126October 21, 1930Negative resistance circuitsHOWARD GRAHAM FRANKBELL TELEPHONE LABOR INC
1779058October 21, 1930Telephone switchboardCHARLES BORGMANN ; MARTING HEBER E ; HAGLAND HARVEY MBELL TELEPHONE LABOR INC
1778894October 21, 1930RelayFRY JACOB RBELL TELEPHONE LABOR INC
1778871October 21, 1930Acoustic deviceSMYTHE EDWIN HBELL TELEPHONE LABOR INC
1778779October 21, 1930Control circuit for transmission systemsWHITING DONALD FBELL TELEPHONE LABOR INC
1778768October 21, 1930Telephone-ringing systemPHILANDER NORTONBELL TELEPHONE LABOR INC
1778759October 21, 1930Submarine signalingGILBERT JOHN JBELL TELEPHONE LABOR INC
1778756October 21, 1930Coupling deviceELMER LLOYD ABELL TELEPHONE LABOR INC
1778751October 21, 1930Control of electrical variationsBUCKLEY OLIVER E ; JOHNSON JOHN BBELL TELEPHONE LABOR INC
1778750October 21, 1930Transmission regulationEDMOND BRUCEBELL TELEPHONE LABOR INC
1781469November 11, 1930Wave filterMASON WARREN PBELL TELEPHONE LABOR INC
1781387November 11, 1930DiaphragmHARRISON HENRY CBELL TELEPHONE LABOR INC
1781385November 11, 1930Telephone-exchange systemHAGUE ALFRED EBELL TELEPHONE LABOR INC
1781363November 11, 1930Electrical testing systemEDMOND BRUCEBELL TELEPHONE LABOR INC
1781351November 11, 1930Vibratory systemTHURAS ALBERT LBELL TELEPHONE LABOR INC
1780937November 11, 1930Testing systemO'NEILL HENRY WBELL TELEPHONE LABOR INC
1780921November 11, 1930Communication systemHORTON JOSEPH WBELL TELEPHONE LABOR INC
1780919November 11, 1930Means for recording telephone conversationsHOLLAND CHARLOTTE MBELL TELEPHONE LABOR INC
1780917November 11, 1930Electric condenserHOCH ELLERY TBELL TELEPHONE LABOR INC
1780910November 11, 1930Testing systemDUNHAM BERT GBELL TELEPHONE LABOR INC
1780906November 11, 1930Automatic toll-switching telephone systemCARPENTER WARREN W ; HERSEY RALPH EBELL TELEPHONE LABOR INC
1782912November 25, 1930Method for eliminating noise in machinerySNOOK HOMER CBELL TELEPHONE LABOR INC
1785062December 16, 1930Transformer systemHORACE WHITTLEBELL TELEPHONE LABOR INC
1785060December 16, 1930Metallurgical processWHITE JOHN HBELL TELEPHONE LABOR INC
1785036December 16, 1930Oscillation generatorMARRISON WARREN A.BELL TELEPHONE LABORATORIES, INCORPORATED
1784978December 16, 1930Testing apparatusTAYLOR HUGH SBELL TELEPHONE LABOR INC
1784879December 16, 1930Magnetic modulator circuitEUGENE PETERSONBELL TELEPHONE LABOR INC
1784874December 16, 1930Control of wave transmissionHUBBARD FRANK ABELL TELEPHONE LABOR INC
1784860December 16, 1930Sound recorderWIEBUSCH CHARLES FBELL TELEPHONE LABOR INC
1784858December 16, 1930Sound-recording systemWENTE EDWARD CBELL TELEPHONE LABOR INC
1784845December 16, 1930Phonograph needleMORRISON LOUIS ABELL TELEPHONE LABOR INC
1784844December 16, 1930Constant frequency wave sourceMARRISON WARREN ABELL TELEPHONE LABOR INC
1784839December 16, 1930Sound-reproducing systemKELLER ARTHUR CBELL TELEPHONE LABOR INC
1784830December 16, 1930Mechanical impedance deviceFLANDERS PAUL BBELL TELEPHONE LABOR INC
1784827December 16, 1930Magnetic materialELMEN GUSTAF WBELL TELEPHONE LABOR INC
1784825December 16, 1930Speech transmissionDUDLEY HOMER WBELL TELEPHONE LABOR INC
1786652December 30, 1930Electrooptical systemHARTLEY RALPH V LBELL TELEPHONE LABOR INC