pdf 43-45 BLR - Crossbar Toll Reprint Popular
By Paul F 837 downloads
43_BLR_Reprint_Crossbar_Toll_tci.pdf
71 pages, 15 articles from Bell Labs Record issues, vol. 22-23, November 1943 thru October 1945, related to Crossbar Switching, multi-frequency pulsing and operator toll dialing. OCR by Clint Gilliland. Bookmarks by Paul Fassbender.
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