pdf BTL History 7: Transmission Technology 1985 Popular
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BTL_History_7_500-473_Transmission_Tech_1925-75_tci_ocr.pdf
825 pages, 83 MB, 500-473, A History of Engineering and Science in the Bell System - Transmission Technology (1925-1975). Missing page 566. Contributed by Sam Etler. Processed by Paul Fassbender.
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