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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 71Aug BLR P226 Improved Speakerphone Will Become 4A In 1974 (424 downloads) Popular Download (pdf, 394 KB)
pdf 71Oct BLR P270 PICTUREPHONE Key Systems (470 downloads) Popular Download (pdf, 2.24 MB)
pdf 71Oct BLR P293 Operator Chairs (441 downloads) Popular Download (pdf, 287 KB)
pdf 71Sep BLR P231 Switching for Multilocation Customers (530 downloads) Popular Download (pdf, 1.78 MB)
pdf 72Apr BLR P110 Helping Handicapped Dial Payphones (411 downloads) Popular Download (pdf, 707 KB)
pdf 72Aug BLR P217 Customer Premises Connective System (479 downloads) Popular Download (pdf, 1.08 MB)
pdf 72Jul BLR P167 Public Coin Telephone Enclosures (495 downloads) Popular Download (pdf, 2.89 MB)
pdf 72May BLR P134 801A Midi PBX (681 downloads) Popular Download (pdf, 1.79 MB)
pdf 72May BLR P140 New Telephone Headsets 60A 61A (480 downloads) Popular Download (pdf, 746 KB)
pdf 72Sep BLR P249 Checkless Society Telephones Card Dialer (471 downloads) Popular Download (pdf, 1.34 MB)
pdf 72Sep BLR P266 Vandal Resistant Payphone Mount (416 downloads) Popular Download (pdf, 797 KB)
pdf 73Dec BLR P353 PICTUREPHONE Big Picture (503 downloads) Popular Download (pdf, 1.96 MB)
pdf 73Jan BLR P9 Key Telephone 4A Call Distributor (590 downloads) Popular Download (pdf, 1.44 MB)
pdf 73Jun BLR P187 Payphone Sentry Mounts (453 downloads) Popular Download (pdf, 334 KB)
pdf 73Mar BLR P94 TouchTone Dial Foil (428 downloads) Popular Download (pdf, 815 KB)
pdf 73May BLR P158 TOUCH A MATIC 32 - Dialer Keyset 2872 (807 downloads) Popular Download (pdf, 336 KB)
pdf 73May BLR P136 805A PBX (1257 downloads) Popular Download (pdf, 1.85 MB)
pdf 73Oct BLR P273 Handicapped Voice Dialing (542 downloads) Popular Download (pdf, 1.70 MB)
pdf 73Sep BLR P233 4A Speakerphone (1144 downloads) Popular Download (pdf, 1.21 MB)
pdf 74Dec BLR P358 Credit Authorization Transaction Telephone (559 downloads) Popular Download (pdf, 917 KB)

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Thanks for new documents from 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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