pdf 503-100-120 i4 Aug78 - 581A Telephone Set Bases Tl Popular
By Paul F 2105 downloads
503-100-120_i4_Aug78_581A_Tel_Set_Bases_tci_ocr.pdf
27 pages, Issue 4, August 1978. Shows 4228 network, U3 receiver, and T1 transmitter (with spring attachment cords).
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