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 56Apr BLR P140 1A1 Key Tel Sys KTS (1008 downloads) Popular Download (pdf, 659 KB)
pdf 56Aug BLR P294 Aluminum Booth (685 downloads) Popular Download (pdf, 778 KB)
pdf 56Aug BLR P298 Telephone Protectors (669 downloads) Popular Download (pdf, 1.20 MB)
pdf 56Aug BLR P313 5300 Type Set (380 downloads) Popular Download (pdf, 224 KB)
pdf 56Jun BLR P208 1A Speakerphone 592 (647 downloads) Popular Download (pdf, 1.55 MB)
pdf 56Mar BLR P116 Tone Ringer Trial (373 downloads) Popular Download (pdf, 558 KB)
pdf 56May BLR P165 Answer Set (367 downloads) Popular Download (pdf, 1.39 MB)
pdf 71Jan BLR P22 558A PBX (959 downloads) Popular Download (pdf, 995 KB)
pdf 54Feb BLR P69 Dial Governors (441 downloads) Popular Download (pdf, 961 KB)
pdf 54Mar BLR P96 Telephone Hazardous Areas KS14476 (404 downloads) Popular Download (pdf, 340 KB)
pdf 54May BLR P197 Coinless Payphone (399 downloads) Popular Download (pdf, 224 KB)
pdf 54Nov BLR P439 Hard of Hearing 532 (369 downloads) Popular Download (pdf, 228 KB)
pdf 54Oct BLR P366 Universal Ringer C4A (575 downloads) Popular Download (pdf, 1.53 MB)
pdf 52dec BLR P456 Telephone Repair Reuse (408 downloads) Popular Download (pdf, 620 KB)
pdf 53apr BLR P130 U1 Receivers Adjustment (393 downloads) Popular Download (pdf, 1.13 MB)
pdf 53apr BLR P158 Installers Tool Case (408 downloads) Popular Download (pdf, 156 KB)
pdf 53jan BLR P9 Lag Linemans Wrench (453 downloads) Popular Download (pdf, 267 KB)
pdf 53jan BLR P22 Early Dial Systems (566 downloads) Popular Download (pdf, 1.35 MB)
pdf 53jun BLR P236 Robot Secretary (344 downloads) Popular Download (pdf, 237 KB)
pdf 53nov BLR P439 1A Answering Set (382 downloads) Popular Download (pdf, 1.35 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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