You are here: Home > Browse the Library > Catalogs, Manuals, Educational Docs (by Company) > Western Electric/Bell System > Publications and Educational Documents (by Date) > BLR

Check out the TCI YouTube channel here. Please subscribe!

Check here for the 2024 Telephone Shows

Download selected

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 74Jun BLR P181 Vinyl Drop Wire (724 downloads) Popular Download (pdf, 1.20 MB)
pdf 74May BLR P153 50A Attendant Console (1304 downloads) Popular Download (pdf, 2.11 MB)
pdf 74Nov BLR P302 812A PBX - ocr (1371 downloads) Popular Download (pdf, 2.06 MB)
pdf 74Nov BLR P318 - Seeking the Ideal in "Hands-Free" Telephony for Speakerphones (742 downloads) Popular Download (pdf, 2.08 MB)
pdf 74Sep BLR P239 Telephones Go Modular (794 downloads) Popular Download (pdf, 6.89 MB)
pdf 74Sep BLR P253 Key Telephone Modular Panels (1030 downloads) Popular Download (pdf, 1.58 MB)
pdf 28Jul BLR P 363 Non Multiple PBX 551A 551B (1708 downloads) Popular Download (pdf, 1.01 MB)
pdf 29Apr BLR P 331 Cordless Switchboard 506A (1673 downloads) Popular Download (pdf, 1.15 MB)
pdf 29Feb BLR P226 Private Branch Exchanges (1350 downloads) Popular Download (pdf, 929 KB)
pdf 29Nov BLR P105 New Multiple PBX 605A (1420 downloads) Popular Download (pdf, 826 KB)
pdf 29Sep BLR P36 Large Capacity PBX 701A (1448 downloads) Popular Download (pdf, 1.30 MB)
pdf 30Feb BLR P263 Testing Ringers Dials (1578 downloads) Popular Download (pdf, 706 KB)
pdf 30Feb BLR P278 - Dial PBX Residence 750-A (1578 downloads) Popular Download (pdf, 719 KB)
pdf 30Jul BLR P527 Multiplying Subscriber Line No 100 (1249 downloads) Popular Download (pdf, 1.18 MB)
pdf 56Aug BLR P302 Small Dial PBX Attendant (427 downloads) Popular Download (pdf, 1.25 MB)
pdf 57Dec BLR P485 Modern Crossbar PBX 756A (708 downloads) Popular Download (pdf, 801 KB)
pdf 61Jun BLR P220 PBX Speeding Calls 756A DSS (449 downloads) Popular Download (pdf, 528 KB)
pdf 62Oct BLR P327 Crossbar CENTREX Service 5Xbar (589 downloads) Popular Download (pdf, 1.72 MB)
pdf 70Aug BLR P195 Data Communications (571 downloads) Popular Download (pdf, 2.48 MB)
pdf 70Oct BLR P259 - Advances in the 1A2 Key Telephone System (858 downloads) Popular Download (pdf, 1.39 MB)

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.

Please send a file to add your name to this list!

30 Latest Additions

Who's online

We have 989 guests online

Hints for using the TCI Library

"Menu Bar" for site navigation.
Many menu choices are hidden until you mouse over words in the black Menu Bar (above).  If you want help getting started, see the links under the word "Introduction" in the Menu Bar.
 
The user interface is oriented toward the user’s choice to either Browse or Search for information.  The Browse the Library menu entry offers many quick links to move around the Library quickly.  Try it!

Three search options.
The Library’s keyword-based searches, called Basic Search and Advanced Search, accept keywords as short as 2 characters (WE, AE, etc.) and search strings up to 255 characters.  If you get more than 1,000 items, refine your search or try the Google Search option.
 
When selected from the Menu Bar, Google only searches for files in the TCI Library.
 
Library INBOX.
The INBOX may hold some files that have been submitted but not fully processed into the Library.  These are often topics of current discussion on the TCI Email Group. Items in the INBOX are not found using Basic or advanced searches, but ARE found by a Google Search.
 
Remember to check the INBOX if you don't find something with the other searches.
 
Finding BSPs.
Many BSPs are currently only identified by BSP number. If a text search doesn’t produce a BSP, try looking in one of the many BSP index documents to find a BSP number for the product you are researching just as you would do if referencing a paper library of the BSPs. Then enter the BSP number in the search box.
 
Finding CDs and SDs.
Some related CDs and SDs are filed in different areas. Try searching for just the numeric portion of the name.  Remember to check the INBOX if you don't find something with the Basic or Advanced searches -- or use the Google search.
 
Compact Category Listing.
When browsing, to change the category listing view from normal to compact, click on Browse the Library in the black menu bar.
 
To change from compact to normal view, click on Document Repository in the drop down under Browse the Library.