pdf CD-65680-01 i12D - 507A, 507B PBX (cropped and OCRed) Popular
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CD-65680-01I12.pdf
Issue 12D. PBX Systems No. 507A and 507B Station Line, Trunk, Connecting, Telephone, Ringing, Buzzer and 2-way Ringdown Tie Trunk Circuits arranged for use with manual or dial central offices.
This contains a concise operational description for outgoing calls and incoming calls.
Contributed by John Novack.
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