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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 38aug BLR P391 Station Cord (545 downloads) Popular Download (pdf, 1.20 MB)
pdf 38jun BLR P336 755PBX (707 downloads) Popular Download (pdf, 1.40 MB)
pdf 38oct BLR P52 Enamel Number Plate (554 downloads) Popular Download (pdf, 1.13 MB)
pdf 38sep BLR P11 Operator Mouthpiece (580 downloads) Popular Download (pdf, 194 KB)
pdf 39dec BLR P97 Lucite Handset (586 downloads) Popular Download (pdf, 122 KB)
pdf 39jul BLR P347 Antisidetone Circuit (1743 downloads) Popular Download (pdf, 819 KB)
pdf 39mar BLR P212 Molded Design F Handset (656 downloads) Popular Download (pdf, 987 KB)
pdf 39mar BLR P230 Wire Toner (581 downloads) Popular Download (pdf, 185 KB)
pdf 40jul BLR P332 Drop Wire (397 downloads) Popular Download (pdf, 1007 KB)
pdf 40jul BLR P342 Sound Tests of Dials and Ringers (413 downloads) Popular Download (pdf, 467 KB)
pdf 40jun BLR P315 1A Key Telephone System (511 downloads) Popular Download (pdf, 1.25 MB)
pdf 40oct BLR P41 Telephone Explosive Atmosphere 320 (376 downloads) Popular Download (pdf, 711 KB)
pdf 41aug BLR P380 Telephone Cords (418 downloads) Popular Download (pdf, 620 KB)
pdf 41dec BLR P106 Station Keys (374 downloads) Popular Download (pdf, 1.42 MB)
pdf 41nov BLR P76 Lineman Handset (441 downloads) Popular Download (pdf, 279 KB)
pdf 41nov BLR P77 Repairman's Test Set ''Pin'' Dial (475 downloads) Popular Download (pdf, 303 KB)
pdf 41oct BLR P34 Coin Collector (448 downloads) Popular Download (pdf, 644 KB)
pdf 42aug BLR P295 Telephone Cords (414 downloads) Popular Download (pdf, 1.04 MB)
pdf 42mar BLR P178 300G Outdoor Set (478 downloads) Popular Download (pdf, 671 KB)
pdf 42oct BLR P45 Hard of Hearing - 332 set (433 downloads) Popular Download (pdf, 748 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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