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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 65Sep BLR P344 Trimline Introduction (372 downloads) Popular Download (pdf, 289 KB)
pdf 66Jan BLR P9 Trimline A Telephone Evolution (360 downloads) Popular Download (pdf, 1.80 MB)
pdf 66Jan BLR P16 New Coin Look (312 downloads) Popular Download (pdf, 1.24 MB)
pdf 66Jan BLR P20 Single Slot Payphone (853 downloads) Popular Download (pdf, 742 KB)
pdf 66Jan BLR P24 CALL A MATIC (401 downloads) Popular Download (pdf, 957 KB)
pdf 66Jan BLR P34 Designing Telephone Components (323 downloads) Popular Download (pdf, 1.03 MB)
pdf 66Mar BLR P85 Key Telephone Systems 1A2 KSUs (532 downloads) Popular Download (pdf, 1.45 MB)
pdf 66Nov BLR P319 Trimline TouchTone Integrated Circuit (330 downloads) Popular Download (pdf, 1.11 MB)
pdf 57Feb BLR P48 Tone Ringer (396 downloads) Popular Download (pdf, 1.70 MB)
pdf 57Jan BLR P6 Answering Service Switchboards (822 downloads) Popular Download (pdf, 893 KB)
pdf 57Jan BLR P15 Dial Testing (378 downloads) Popular Download (pdf, 1.00 MB)
pdf 57Jan BLR P22 Testing Cords (322 downloads) Popular Download (pdf, 848 KB)
pdf 57Jun BLR P219 Operator Chairs (561 downloads) Popular Download (pdf, 1.04 MB)
pdf 57Jun BLR P231 Experimental Drive In Payphone (348 downloads) Popular Download (pdf, 281 KB)
pdf 56Dec BLR P473 Drop Wire Cap (312 downloads) Popular Download (pdf, 211 KB)
pdf 56Oct BLR P381 Military Telephone TA43PT (652 downloads) Popular Download (pdf, 1.62 MB)
pdf 56Sep BLR P334 Experimental Picturephone (337 downloads) Popular Download (pdf, 424 KB)
pdf 56Jul BLR P252 Color Telephones 500 Type (458 downloads) Popular Download (pdf, 789 KB)
pdf 55Feb BLR P70 Drop Wire Clamp (378 downloads) Popular Download (pdf, 496 KB)
pdf 55Oct BLR P361 Volume Control Telephone 532 151A Amp (348 downloads) Popular Download (pdf, 723 KB)

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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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