Folder 530 - 559 Private Branch Exchanges
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Categories
Folder 534 Division - PBX - Common Sections
Sections Applying to more than one PBX Series - 500, 600, 700 and 800 Series Manual and Dial PBX
Folder 536 Division - 500 Series PBX
500 Series PBX
Folder 540 Division - More Than One PBX Series
Includes Centrex CU, Attendant Equipment for Centrex CO and "TOUCH-TONE" Calling
Folder 548 Division - 750A PBX
750A PBX
Documents
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