pdf 74Sep BLR P239 Telephones Go Modular Popular
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74sep_BLR_P239_Telephones_Go_Modular_tci_ocr.pdf
Bell Labs Record, Sept. 1974. "Telephone Sets Go Mod (Modular, That Is)" Modular Wiring. Formatted for printing (individual pages). Modular wiring was phased in beginning in 1972, an important element in the new PhoneCenter stores. Contributed by Chuck Hensley.
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