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Folder BLR

See Chuck Hensley's comprehensive index to articles in the BLR in the folder below.  It can be used to locate articles to research, whether found in the TCI LIbrary or elsewhere.

Chuck has offered to scan a limited number of pages from his collection (at his convenience).  Send requests using the "Contact Us" link in the Menu Bar above.

HINT:  Search for "BLR" followed by a topic keyword to find a series of related articles.  Use alphabetic sort to display them in chronological order.  e.g.  BLR PBX  or  BLR Picturephone.

When posted, complete scanned BLR issues from Sept. 1925 - Dec. 1961 were available here:
  https://worldradiohistory.com/Bell_Laboratories_Record_Issue_Key.htm

Categories

Folder BLR Collections
Folder BLR Index

Documents

Select Toggle Title Date Download
pdf 67Feb BLR P49 800A PBX (523 downloads) Popular Download (pdf, 1.66 MB)
pdf 67Jun BLR P202 Experimental Lineless (Cordless) Telephone (701 downloads) Popular Download (pdf, 609 KB)
pdf 67May BLR P161 OSP Drop Closure (450 downloads) Popular Download (pdf, 395 KB)
pdf 68Apr BLR P130 Experimental Electronic Telephone (395 downloads) Popular Download (pdf, 415 KB)
pdf 68Feb BLR P40 Bell System History 1 (393 downloads) Popular Download (pdf, 2.57 MB)
pdf 68Jan BLR P9 60 Years Of PBX Development (918 downloads) Popular Download (pdf, 1.91 MB)
pdf 68Mar BLR P77 Bell System History 2 (502 downloads) Popular Download (pdf, 1.88 MB)
pdf 57Sep BLR P348 500 Set Distinctive Ringing (316 downloads) Popular Download (pdf, 1.16 MB)
pdf 58Apr BLR P149 New Booth (365 downloads) Popular Download (pdf, 163 KB)
pdf 58Aug BLR P308 New Station Apparatus Tests: Single Slot Payphone & Repertory Dialer (403 downloads) Popular Download (pdf, 1.26 MB)
pdf 59Apr BLR P145 New Protector (432 downloads) Popular Download (pdf, 832 KB)
pdf 59Apr BLR P151 500 Set Design Honor (362 downloads) Popular Download (pdf, 142 KB)
pdf 59Aug BLR Cover Push Button Telephone (411 downloads) Popular Download (pdf, 181 KB)
pdf 59aug BLR P313 Experimental Pushbutton Set (334 downloads) Popular Download (pdf, 592 KB)
pdf 59Aug BLR P313 Push Button 500 Set Dataphone Card Reader (343 downloads) Popular Download (pdf, 453 KB)
pdf 59May BLR P187 Telephone Cords (360 downloads) Popular Download (pdf, 441 KB)
pdf 59Nov BLR P430 Coin Disposal Mechanism (351 downloads) Popular Download (pdf, 898 KB)
pdf 60Dec BLR P470 All Number Calling (473 downloads) Popular Download (pdf, 864 KB)
pdf 60Feb BLR P71 WECo Production 1959 (333 downloads) Popular Download (pdf, 235 KB)
pdf 60Jan BLR P23 Experimental Dial In Handset Phone (375 downloads) Popular Download (pdf, 745 KB)

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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.

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