pdf BTL History 3: Switching Technology - 1982 Popular
By Paul F 2772 downloads
BTL_History_Switching_Systems_1982_tci.pdf
652 pages. 34MB. A History of Engineering and Science in the Bell System. Switching Technology (1925 - 1975), 1982. Contributed by Sam Etler, with post-processing by Clint Gilliland.
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