pdf SD-65736-011 i2D - 507A, 507B PBX - Modified for use with Tie Trunks Popular
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SD_65736_01_PBX_No.507A_B.pdf
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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