pdf SD-65736-011 i2D - 507A, 507B PBX - Modified for use with Tie Trunks Popular

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SD-65736-011 i2D - 507A, 507B PBX - Modified for use with Tie Trunks

PBX 507A or 507B Battery Feed, Trunk Keys, Supervisory Signal, Station Line Key, Attendant's Key and Station Line Key.  Modifications and additions to be made locally.

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