pdf 43-45 BLR - Crossbar Toll Reprint Popular
By Paul F 1321 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 Tim Fox, Andrew Cook, Steph Kerman, Jason Anderson, Doug Duffy, Bruce Patterson, Jeremy Walters, Nick Hunseder, Ed Burnett, Ralph Meyer, Shane Young, David Brown, the Connections Museum, Paul Fassbender, Lou Maffei, Rick Thoensen, Sheila Flory, Tom Hesson, Jim Hurtle, Ed Palazzo, Remco Enthoven, Jon Kolger, Paul Ivester, and Len Hicken.
Please send a file to add your name to this list!
Who's online
We have 713 guests online