5805-27-006-6121

Trunk Signaling Telephone Circuit

5805270066121 270066121 ROF1375338/1 ROF 137 5338/1

A telephone circuit consisting primarily of telephone relays and associated telephone equipment designed for use in connection with a straight-forward trunk circuit to provide straight-forward signaling facilities on a two wire basis where telephone carrier equipment is not used. View more Trunk Signaling Telephone Circuit