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C71.909 IA PTT Jan57 - Service Observing For TelCo Business Offices

Issue A, January 1957.  Pacific Tel & Tel.  Includes 101-type key units.  Contributed by Steve Cichorsky.

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

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