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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 32sep BLR P15 Navy Dial (561 downloads) Popular Download (pdf, 395 KB)
pdf 33apr BLR P244 15A and 23A Key Equipments, Residential, & E Handset Mounting (584 downloads) Popular Download (pdf, 436 KB)
pdf 33jul BLR P330 Dial Stroboscope (545 downloads) Popular Download (pdf, 1.04 MB)
pdf 34jan BLR P160 Early Bells (633 downloads) Popular Download (pdf, 159 KB)
pdf 34jul BLR P322 - Early Handsets (822 downloads) Popular Download (pdf, 973 KB)
pdf 34jul BLR P343 Jacks and Plugs for Portable Telephones (622 downloads) Popular Download (pdf, 1.16 MB)
pdf 34jun BLR P297 Telephone Explosive Atmosphere (487 downloads) Popular Download (pdf, 1.15 MB)
pdf 34sep BLR P25 Switchboard Cord (628 downloads) Popular Download (pdf, 1014 KB)
pdf 35may BLR P265 Outdoor Telephone 300 Type (631 downloads) Popular Download (pdf, 592 KB)
pdf 35nov BLR P81 Flat Inside Wire (562 downloads) Popular Download (pdf, 169 KB)
pdf 36aug BLR P381 Artificial Mouth (562 downloads) Popular Download (pdf, 155 KB)
pdf 36aug BLR P399 Station Protector (548 downloads) Popular Download (pdf, 242 KB)
pdf 36dec BLR P111 Selective Ringing (716 downloads) Popular Download (pdf, 1.06 MB)
pdf 36jul BLR P359 300 Set Trial (744 downloads) Popular Download (pdf, 140 KB)
pdf 36may BLR P297 Larger Telephone Booth (564 downloads) Popular Download (pdf, 323 KB)
pdf 36may BLR P312 Telephone - Conference Aid (597 downloads) Popular Download (pdf, 1.52 MB)
pdf 36sep BLR P21 Hand Tools (634 downloads) Popular Download (pdf, 727 KB)
pdf 37aug BLR P370 101-type Key Equipments (687 downloads) Popular Download (pdf, 1.74 MB)
pdf 37feb BLR P190 Ringer Remagnitizer (651 downloads) Popular Download (pdf, 1003 KB)
pdf 38apr BLR P282 Magnetic Telephone (568 downloads) Popular Download (pdf, 495 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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