pdf Cord Switchboard Service Manual NonMultiple Types 550 551 560 IBT [LARGE FILE] Popular

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Cord Switchboard Service Manual NonMultiple Types 550 551 560 IBT [LARGE FILE]

36MB. July 1961, Illinois Bell, PBX 75. Photos of switchboard.  Contributed by Steve Cichorsky.

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Thanks for new documents from Jeff Lamb, Chuck Hensley, John Novack, Paul Fassbender, Clint Gilliland, Steve Cichorsky, John Gilbert, Chuck Batson, Alan David, Steve Flocke, Paul Wills, Dave Gruger, Jim Prather, John Stancliff and Sam Etler.

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