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 65Sep BLR P344 Trimline Introduction Popular

385 downloads

Download (pdf, 289 KB)

65Sep_BLR_P344_Trimline_Introduction.pdf

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Jan BLR P9 Trimline A Telephone Evolution Popular

379 downloads

Download (pdf, 1.80 MB)

66Jan_BLR_P9_Trimline_A_Telephone_Evolution.pdf

66Jan BLR P9 Trimline A Telephone Evolution

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Jan BLR P16 New Coin Look Popular

330 downloads

Download (pdf, 1.24 MB)

66Jan_BLR_P16_New_Coin_Look.pdf

66Jan BLR P16 New Coin Look

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Jan BLR P20 Single Slot Payphone Popular

910 downloads

Download (pdf, 742 KB)

66Jan_BLR_P20_Single_Slot_Payphone.pdf

66Jan BLR P20 Single Slot Payphone

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Jan BLR P24 CALL A MATIC Popular

420 downloads

Download (pdf, 957 KB)

66Jan_BLR_P24_CALL_A_MATIC.pdf

66Jan BLR P24 CALL A MATIC

Call-a-matic Dialer. Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Jan BLR P34 Designing Telephone Components Popular

350 downloads

Download (pdf, 1.03 MB)

66Jan_BLR_P34_Designing_Telephone_Components.pdf

66Jan BLR P34 Designing Telephone Components

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Mar BLR P85 Key Telephone Systems 1A2 KSUs Popular

569 downloads

Download (pdf, 1.45 MB)

66Mar_BLR_P85_Key_Telephone_Systems_1A2_KSUs.pdf

66Mar BLR P85 Key Telephone Systems 1A2 KSUs

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 66Nov BLR P319 Trimline TouchTone Integrated Circuit Popular

347 downloads

Download (pdf, 1.11 MB)

66Nov_BLR_P319_Trimline_TouchTone_Integrated_Circuit.pdf

66Nov BLR P319 Trimline TouchTone Integrated Circuit

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 57Feb BLR P48 Tone Ringer Popular

417 downloads

Download (pdf, 1.70 MB)

57Feb_BLR_P48_Tone_Ringer.pdf

57Feb BLR P48 Tone Ringer

Bell Laboratories Record, February 1957.  Field Trials in Americus, GA and Crystal Lake, IL. Contributed by Chuck Hensley.

pdf 57Jan BLR P6 Answering Service Switchboards Popular

869 downloads

Download (pdf, 893 KB)

57Jan_BLR_P6_Answering_Service_Switchboards.pdf

57Jan BLR P6 Answering Service Switchboards

Bell Laboratories Record, January 1957.  557A (secretary and PBX) and 557B (answering service).  Contributed by Chuck Hensley.

pdf 57Jan BLR P15 Dial Testing Popular

397 downloads

Download (pdf, 1.00 MB)

57Jan_BLR_P15_Dial_Testing.pdf

57Jan BLR P15 Dial Testing

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 57Jan BLR P22 Testing Cords Popular

347 downloads

Download (pdf, 848 KB)

57Jan_BLR_P22_Testing_Cords.pdf

57Jan BLR P22 Testing Cords

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 57Jun BLR P219 Operator Chairs Popular

588 downloads

Download (pdf, 1.04 MB)

57Jun_BLR_P219_Operator_Chairs.pdf

57Jun BLR P219 Operator Chairs

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 57Jun BLR P231 Experimental Drive In Payphone Popular

366 downloads

Download (pdf, 281 KB)

57Jun_BLR_P231_Experimental_Drive_in_Payphone.pdf

Bell Laboratories Record. Contributed by Chuck Hensley.

pdf 56Dec BLR P473 Drop Wire Cap Popular

336 downloads

Download (pdf, 211 KB)

56Dec_BLR_P473_Drop_Wire_Cap.pdf

56Dec BLR P473 Drop Wire Cap

Bell Labs Record. Contributed by Chuck Hensley.

pdf 56Oct BLR P381 Military Telephone TA43PT Popular

686 downloads

Download (pdf, 1.62 MB)

56Oct_BLR_P381_Military_Telephone_TA43PT.pdf

56Oct BLR P381 Military Telephone TA43PT

Bell Labs Record. Contributed by Chuck Hensley.

pdf 56Sep BLR P334 Experimental Picturephone Popular

359 downloads

Download (pdf, 424 KB)

56Sep_BLR_P334_Experimental_Picturephone.pdf

56Sep BLR P334 Experimental Picturephone

Bell Labs Record. Contributed by Chuck Hensley.

pdf 56Jul BLR P252 Color Telephones 500 Type Popular

490 downloads

Download (pdf, 789 KB)

56Jul_BLR_P252_Color_Telephones_500_type.pdf

56Jul BLR P252 Color Telephones 500 Type

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 55Feb BLR P70 Drop Wire Clamp Popular

393 downloads

Download (pdf, 496 KB)

55Feb_BLR_P70_Drop_Wire_Clamp.pdf

55Feb BLR P70 Drop Wire Clamp

Bell Labs Record.  Contributed by Chuck Hensley.

pdf 55Oct BLR P361 Volume Control Telephone 532 151A Amp Popular

371 downloads

Download (pdf, 723 KB)

55Oct_BLR_p361_Volume_Control_Telephone_532_151A_amp.pdf

Bell Labs Record.  Contributed by Chuck Hensley.

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