pdf 43-45 BLR - Crossbar Toll Reprint Popular
By Paul F 831 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.
New User?
Read the articles under "Introduction" in the black menu bar above.
Recent Contributors
Thanks for new documents from Ed Palazzo, Bruce Patterson, Jon Kolger, Paul Ivester, Len Hicken, Paul Fassbender, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), the Connections Museum, Rick Walsh, Jeff Lamb, Jeremy Walters, Mark Cuccia, Alan David, Harry Joseph, Charlie Terry, Karl Brose, Dennis Hock, Tim Griffin, Remco Enthoven, and Steve Cichorsky.
Please send a file to add your name to this list!
Who's online
We have 1059 guests online