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 were available here:
  http://www.americanradiohistory.com/Bell_Laboratories_Record_Issue_Key.htm

Documents

Order by : Name | Date | Hits [ Descendent ]

70oct BLR - 1A2 Advances 70oct BLR - 1A2 Advances

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 6.21 MB
Downloads: 705

Oct 70, Bell Labs Record, Pages 259-263 plus cover. "Advances in the 1A2 Key Telephone System"

66mar BLR -  1A2 Key Telephone System 66mar BLR - 1A2 Key Telephone System

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 3.44 MB
Downloads: 1464

Mar 1966, Bell Labs Review, Pages 85-88. "Key Telephone System: The Latest Chapter"

74nov BLR - p302 812A PBX 74nov BLR - p302 812A PBX

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 9.28 MB
Downloads: 1269

November 1974 Bell Labs Record.

74sep BLR P238 - Modular Set Introduction 74sep BLR P238 - Modular Set Introduction

Date added: 10/28/2009
Date modified: 02/24/2014
Filesize: 11.19 MB
Downloads: 625

11MB.  Sep 74, Bell Labs Record, Pages 238-244 plus covers. "Telephone Sets Go Mod (Modular, That Is)"  Modular Wiring.

65jun BLR - No. 1 ESS - [1] pp 194-213 [LARGE FILE] 65jun BLR - No. 1 ESS - [1] pp 194-213 [LARGE FILE]

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 26.35 MB
Downloads: 503

June 1965 Bell Labs Record (BLR) special Issue includes: Evolution of Telephone Switching, From Morris to Succassuna, The Stored Program, The Control Unit, Memory Devices, The Switching Network, Mechanical Design, Testing The System, Cutover, etc.   -- In four downloads, part 1. 1ESS.

65jun BLR - No. 1 ESS - [2] pp 214-235 [LARGE FILE] 65jun BLR - No. 1 ESS - [2] pp 214-235 [LARGE FILE]

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 27.14 MB
Downloads: 449

1ESS Part 2 of 4.

65jun BLR - No. 1 ESS - [3] pp 236-261 [LARGE FILE] 65jun BLR - No. 1 ESS - [3] pp 236-261 [LARGE FILE]

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 28.52 MB
Downloads: 435

1ESS Part 3 of 4.

65jun BLR - No. 1 ESS - [4] pp 262-281 [LARGE FILE] 65jun BLR - No. 1 ESS - [4] pp 262-281 [LARGE FILE]

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 17.75 MB
Downloads: 427

1ESS Part 4 of 4.

66jan BLR - Trimline Development 66jan BLR - Trimline Development

Date added: 10/28/2009
Date modified: 03/15/2013
Filesize: 7.44 MB
Downloads: 689

Jan 66, Bell Labs Record, pp 8-14. "The Evolution Of A Telephone,"   Great photo evolution chart showing prototypes on page 10 and info on field trials.

74dec BLR P361 - DUE - Detection of Unauthorized Equipment - BLR 74dec BLR P361 - DUE - Detection of Unauthorized Equipment - BLR

Date added: 11/04/2009
Date modified: 02/24/2014
Filesize: 479.71 kB
Downloads: 770

December 1974 Bell Labs Record. "Unauthorized Phones Get Their Due"

41apr BLR "No Such Number: Tone for Dial Systems" 41apr BLR "No Such Number: Tone for Dial Systems"

Date added: 08/02/2011
Date modified: 03/15/2013
Filesize: 2.24 MB
Downloads: 721

April 1941 Bell Labs Record. Contributed by Steve Cichorsky

40aug BLR p369 321A Loudspeaking Tel Set and 2A Key Tel System 40aug BLR p369 321A Loudspeaking Tel Set and 2A Key Tel System

Date added: 08/06/2011
Date modified: 12/27/2013
Filesize: 6.73 MB
Downloads: 455

August 1941 Bell Labs Record.  Contributed by Steve Cichorsky.

41apr BLR National Defense And The Bell System 41apr BLR National Defense And The Bell System

Date added: 08/06/2011
Date modified: 03/15/2013
Filesize: 26.92 MB
Downloads: 433

April 1941 Bell Labs Record.  Contributed by Steve Cichorsky.

41apr BLR p234 Remote Control For Reversible Program Circuits 41apr BLR p234 Remote Control For Reversible Program Circuits

Date added: 08/06/2011
Date modified: 03/15/2013
Filesize: 5.82 MB
Downloads: 412

April 1941 Bell Labs Record.

44 Crossbar Toll Reprint BLR 1944 Ocr R 44 Crossbar Toll Reprint BLR 1944 Ocr R

Date added: 05/06/2012
Date modified: 03/15/2013
Filesize: 12.96 MB
Downloads: 475

Articles from November 1943 thru October 1945 Bell Labs Record issues related to Crossbar Switching.  OCR by Clint Gilliland.

26mar BLR P31 Protective Finish 26mar BLR P31 Protective Finish

Date added: 03/15/2013
Date modified: 03/15/2013
Filesize: 538.75 kB
Downloads: 239

Bell Labs Record.  Contributed by Chuck Hensley. 

27aug BLR P427 Dial Tester 27aug BLR P427 Dial Tester

Date added: 03/15/2013
Date modified: 03/15/2013
Filesize: 682.07 kB
Downloads: 295

Bell Labs Record.  Contributed by Chuck Hensley. 

27jan BLR P155 Accelerated Testing 27jan BLR P155 Accelerated Testing

Date added: 03/15/2013
Date modified: 03/15/2013
Filesize: 923.22 kB
Downloads: 231

Bell Labs Record.  Contributed by Chuck Hensley. 

28aug BLR P399 740A PBX 28aug BLR P399 740A PBX

Date added: 03/15/2013
Date modified: 03/15/2013
Filesize: 820.17 kB
Downloads: 258

Bell Labs Record.  Contributed by Chuck Hensley. 

28oct BLR P44 Dialing Errors 28oct BLR P44 Dialing Errors

Date added: 03/15/2013
Date modified: 03/15/2013
Filesize: 474.81 kB
Downloads: 213

Bell Labs Record.  Contributed by Chuck Hensley. 

Recent Contributors

Thanks for new documents from David Gruger, Jeff Lamb, Walt Aydelotte, Dennis Hock, Steve Flocke, Paul Wills, Sam Etler, Fred Haynes, John Novack, Clint Gilliland, Steve Cichorsky and Karl Brose.

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