pdf 503-100-100 i4 Jul77 - Telephone Sets Modular Type Tl Popular
By Paul F 2571 downloads
503-100-100_i4_Jul77_Tel_Sets_Modular-Type_tci_ocr.pdf
Issue 4, July 1977. Includes info on notching, D2M bases and modular components - including plugs, jacks, connecting blocks, backboards and the elusive 123A apparatus blank ("mouse hole"). Describes "M" number cards.
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