| Section
| Date
| Issue
| Size
| Title
|
| 551-100-100 | 1975-05-01 | 1 | 9.89 MB | 756A PBX - Installation and Test (TOP) |
| 551-100-101 | 1975-05-01 | 1 | 6.40 MB | 756A PBX - Repair (TOP) |
| 551-144-210 | 1968-03-01 | 3 | 2.62 MB | Miscellaneous Equipment (Tie Trunks, Loudspeaker Paging Trunk, Recorded Telephone Dictation Trunk, 3A Code Call Unit, Busy Verification Auxiliary Trunk, and Auxiliary Position Circuit for Remote Trunk Answering) - Installation Information - 756A PBX |
| 551-147-210 | 1968-08-01 | 3 | 3.85 MB | Service Options (Stations, Trunks, Dial Pulse Register, Central Office Alarm, Night Connections, Registers, Power Plant, Etc.) - Method of Providing |
| 551-200-210 | | 4I | 3.13 MB | 757A PBX (Unknown Title) |
| 551-561-500 | 1976-05-01 | 2 | 2.06 MB | Digital Line Circuit (SD-73095-01), Digital Test Line Circuit (SD-73099-01), and Dial Tone Speed Measuring Circuit (SD-73103-01) - Operation Tests - 758C Switching System for Switched Digital Data System (SDDS) |
| 551-720-210 | 1979-03-01 | 3 | 1.65 MB | Switching Cabinet - Identification, Installation, and Connections - 761B PBX |
| 551-722-210 | 1979-06-01 | 2 | 1.75 MB | Attendant and Station Equipment - Identification, Installation, and Connections - 761B PBX |
| 551-736-301 | 1968-09-01 | 2 | 1.49 MB | Attendant and Station Equipment - Method of Operation - 761B PBX |