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 53oct BLR P407 Cords Machine (300 downloads) Popular Download (pdf, 739 KB)
pdf 53sep BLR P342 Trains Payphone (441 downloads) Popular Download (pdf, 1.89 MB)
pdf 52apr BLR P183 Army Telephone (347 downloads) Popular Download (pdf, 422 KB)
pdf 52aug BLR P317 500 Handset G1 T1 U1 (386 downloads) Popular Download (pdf, 620 KB)
pdf 52jan BLR P12 Lettered Dial (304 downloads) Popular Download (pdf, 437 KB)
pdf 52jul BLR P295 JKT Station Wire (423 downloads) Popular Download (pdf, 534 KB)
pdf 52may BLR P205 507 PBX (884 downloads) Popular Download (pdf, 785 KB)
pdf 52may BLR P211 500 Dial 7A (388 downloads) Popular Download (pdf, 833 KB)
pdf 50May BLR Cover Drop Test (463 downloads) Popular Download (pdf, 126 KB)
pdf 42May BLR P222 Small Ringer (419 downloads) Popular Download (pdf, 1013 KB)
pdf 50Feb BLR Cover 500Set (416 downloads) Popular Download (pdf, 291 KB)
pdf 51Dec BLR P545 Adjusting C Ringer (427 downloads) Popular Download (pdf, 822 KB)
pdf 51Jan BLR P32 WECo Indianapolis (639 downloads) Popular Download (pdf, 418 KB)
pdf 51Nov BLR P511 500 Transmission 425A Network (444 downloads) Popular Download (pdf, 444 KB)
pdf 51Oct BLR P460 740E PBX (619 downloads) Popular Download (pdf, 1.27 MB)
pdf 51Oct BLR P471 500 Ringer C-type (471 downloads) Popular Download (pdf, 615 KB)
pdf 51Sep BLR P414 500 Set Tuffnell (355 downloads) Popular Download (pdf, 818 KB)
pdf 42May BLR P222 Small Ringer B1A For 300 Series (491 downloads) Popular Download (pdf, 572 KB)
pdf 26mar BLR P31 Protective Finish (1301 downloads) Popular Download (pdf, 538 KB)
pdf 27aug BLR P427 - Dial Tester (1262 downloads) Popular Download (pdf, 682 KB)

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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