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

Documents

pdf 74Jun BLR P181 Vinyl Drop Wire Popular

728 downloads

Download (pdf, 1.20 MB)

74Jun_BLR_P181_Vinyl_Drop_Wire.pdf

74Jun BLR P181 Vinyl Drop Wire

Bell Labs Record. Contributed by Chuck Hensley.

pdf 74May BLR P153 50A Attendant Console Popular

1307 downloads

Download (pdf, 2.11 MB)

74May_BLR_P153_50A_Attendant_Console.pdf

74May BLR P153 50A Attendant Console

Bell Labs Record. Contributed by Chuck Hensley.

pdf 74Nov BLR P302 812A PBX - ocr Popular

1374 downloads

Download (pdf, 2.06 MB)

74Nov_BLR_P303_812A_PBX.pdf

74Nov BLR P302 812A PBX - ocr

Bell Labs Record. OCRed and size-reduced. Contributed by Chuck Hensley.

pdf 74Nov BLR P318 - Seeking the Ideal in "Hands-Free" Telephony for Speakerphones Popular

745 downloads

Download (pdf, 2.08 MB)

74Nov_BLR_P318_Seeking_Ideal_HandsFree_Telephony.pdf

74Nov BLR P318 - Seeking the Ideal in "Hands-Free" Telephony for Speakerphones

Bell Labs Record. Keywords: Hands free, Center clipping. Contributed by Chuck Hensley.

pdf 74Sep BLR P239 Telephones Go Modular Popular

797 downloads

Download (pdf, 6.89 MB)

74sep_BLR_P239_Telephones_Go_Modular_tci_ocr.pdf

74Sep BLR P239 Telephones Go Modular

Bell Labs Record,  Sept. 1974. "Telephone Sets Go Mod (Modular, That Is)" Modular Wiring. Formatted for printing (individual pages). Modular wiring was phased in beginning in 1972, an important element in the new PhoneCenter stores. Contributed by Chuck Hensley.

pdf 74Sep BLR P253 Key Telephone Modular Panels Popular

1034 downloads

Download (pdf, 1.58 MB)

74Sep_BLR_P253_Key_Telephone_Modular_Panels.pdf

74Sep BLR P253 Key Telephone Modular Panels

Bell Labs Record. Contributed by Chuck Hensley.

pdf 28Jul BLR P 363 Non Multiple PBX 551A 551B Popular

1713 downloads

Download (pdf, 1.01 MB)

28Jul_BLR_P 363_Non_Multiple_PBX_551A_551B.pdf

28Jul BLR P 363 Non Multiple PBX 551A 551B

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 29Apr BLR P 331 Cordless Switchboard 506A Popular

1675 downloads

Download (pdf, 1.15 MB)

29Apr_BLR_P 331_Cordless_Switchboard_506A.pdf

29Apr BLR P 331 Cordless Switchboard 506A

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 29Feb BLR P226 Private Branch Exchanges Popular

1352 downloads

Download (pdf, 929 KB)

29Feb_BLR_P226_Private_Branch_Exchanges.pdf

29Feb BLR P226 Private Branch Exchanges

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 29Nov BLR P105 New Multiple PBX 605A Popular

1422 downloads

Download (pdf, 826 KB)

29Nov_BLR_P105_New_Multiple_PBX_605A.pdf

29Nov BLR P105 New Multiple PBX 605A

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 29Sep BLR P36 Large Capacity PBX 701A Popular

1450 downloads

Download (pdf, 1.30 MB)

29Sep_BLR_P36_Large_Capacity_PBX_701A.pdf

29Sep BLR P36 Large Capacity PBX 701A

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 30Feb BLR P263 Testing Ringers Dials Popular

1580 downloads

Download (pdf, 706 KB)

30Feb_BLR_P263_Testing_Ringers_Dials.pdf

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 30Feb BLR P278 - Dial PBX Residence 750-A Popular

1580 downloads

Download (pdf, 719 KB)

30Feb_BLR_P278_Dial_PBX_Residence_750A.pdf

30Feb BLR P278 - Dial PBX Residence 750-A

Bell Labs Record.  750A PBX.  Contributed by Chuck Hensley.

pdf 30Jul BLR P527 Multiplying Subscriber Line No 100 Popular

1251 downloads

Download (pdf, 1.18 MB)

30Jul_BLR_P527_Multiplying_Subscriber_Line_No_100.pdf

30Jul BLR P527 Multiplying Subscriber Line No 100

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 56Aug BLR P302 Small Dial PBX Attendant Popular

429 downloads

Download (pdf, 1.25 MB)

56Aug_BLR_P302_Small_Dial_PBX_Attendant.pdf

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 57Dec BLR P485 Modern Crossbar PBX 756A Popular

710 downloads

Download (pdf, 801 KB)

57Dec_BLR_P485_Modern_Crossbar_PBX_756A.pdf

57Dec BLR P485 Modern Crossbar PBX 756A

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 61Jun BLR P220 PBX Speeding Calls 756A DSS Popular

452 downloads

Download (pdf, 528 KB)

61Jun_BLR_P220_PBX_Speeding_Calls_756A_DSS.pdf

61Jun BLR P220 PBX Speeding Calls 756A DSS

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 62Oct BLR P327 Crossbar CENTREX Service 5Xbar Popular

592 downloads

Download (pdf, 1.72 MB)

62Oct_BLR_P327_Crossbar_CENTREX_Service_5Xbar.pdf

62Oct BLR P327 Crossbar CENTREX Service 5Xbar

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 70Aug BLR P195 Data Communications Popular

575 downloads

Download (pdf, 2.48 MB)

70Aug_BLR_P195_Data_Communications.pdf

70Aug BLR P195 Data Communications

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 70Oct BLR P259 - Advances in the 1A2 Key Telephone System Popular

861 downloads

Download (pdf, 1.39 MB)

70Oct_BLR_P259_1A2_Key_Advances.pdf

70Oct BLR P259 - Advances in the 1A2 Key Telephone System

1.4MB. Bell Labs Record.  OCR.  Contributed by Chuck Hensley.

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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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