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 71Apr BLR P127 PICTUREPHONE For Business 850A PBX (555 downloads) Popular Download (pdf, 804 KB)
pdf 71Feb BLR P61 Card Dialer ANSI Cards (607 downloads) Popular Download (pdf, 268 KB)
pdf 59Jan BLR P23 PBX Crossbar Circuitry 756A (422 downloads) Popular Download (pdf, 1.52 MB)
pdf 63Nov BLR P374 101ESS (453 downloads) Popular Download (pdf, 2.01 MB)
pdf 66May BLR P159 Expanding 101ESS (1212 downloads) Popular Download (pdf, 1.71 MB)
pdf 68Aug BLR P238 Coin Level Detector (384 downloads) Popular Download (pdf, 562 KB)
pdf 68Nov BLR P346 Protection For Receivers 104A Varistor (531 downloads) Popular Download (pdf, 878 KB)
pdf 68Oct BLR P283 Evolution Of PICTUREPHONE (499 downloads) Popular Download (pdf, 2.67 MB)
pdf 69Jul BLR P220 New Lightweight Receiver LB For Trimline (458 downloads) Popular Download (pdf, 294 KB)
pdf 69Jun BLR P138 PICTUREPHONE (480 downloads) Popular Download (pdf, 1.47 MB)
pdf 69Jun BLR P143 PICTUREPHONE Picture Model II (452 downloads) Popular Download (pdf, 1.24 MB)
pdf 69Mar BLR P77 Metroliner Train Telephones (890 downloads) Popular Download (pdf, 2.81 MB)
pdf 69Nov BLR P320 LED Telephone Lamps (462 downloads) Popular Download (pdf, 1.67 MB)
pdf 69Oct BLR P293 Dialtone First (688 downloads) Popular Download (pdf, 1.11 MB)
pdf 69Sep BLR P280 Code-Com Telephone For Handicapped (475 downloads) Popular Download (pdf, 1.08 MB)
pdf 58Aug BLR P352 Bedroom Set Prototype Princess (381 downloads) Popular Download (pdf, 215 KB)
pdf 58Mar BLR P81 6A KTS (463 downloads) Popular Download (pdf, 1.62 MB)
pdf 59Dec BLR P464 Single Slot Coin Phone Trial Woodbridge (443 downloads) Popular Download (pdf, 1.37 MB)
pdf 67Apr BLR P122 Jacketed Station Wire (1135 downloads) Popular Download (pdf, 648 KB)
pdf 67Dec BLR P374 New Picturephone Model II (402 downloads) Popular Download (pdf, 1.01 MB)

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.

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