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 67Feb BLR P49 800A PBX (463 downloads) Popular Download (pdf, 1.66 MB)
pdf 67Jun BLR P202 Experimental Lineless (Cordless) Telephone (603 downloads) Popular Download (pdf, 609 KB)
pdf 67May BLR P161 OSP Drop Closure (388 downloads) Popular Download (pdf, 395 KB)
pdf 68Apr BLR P130 Experimental Electronic Telephone (353 downloads) Popular Download (pdf, 415 KB)
pdf 68Feb BLR P40 Bell System History 1 (353 downloads) Popular Download (pdf, 2.57 MB)
pdf 68Jan BLR P9 60 Years Of PBX Development (871 downloads) Popular Download (pdf, 1.91 MB)
pdf 68Mar BLR P77 Bell System History 2 (433 downloads) Popular Download (pdf, 1.88 MB)
pdf 57Sep BLR P348 500 Set Distinctive Ringing (288 downloads) Popular Download (pdf, 1.16 MB)
pdf 58Apr BLR P149 New Booth (326 downloads) Popular Download (pdf, 163 KB)
pdf 58Aug BLR P308 New Station Apparatus Tests: Single Slot Payphone & Repertory Dialer (364 downloads) Popular Download (pdf, 1.26 MB)
pdf 59Apr BLR P145 New Protector (378 downloads) Popular Download (pdf, 832 KB)
pdf 59Apr BLR P151 500 Set Design Honor (319 downloads) Popular Download (pdf, 142 KB)
pdf 59Aug BLR Cover Push Button Telephone (369 downloads) Popular Download (pdf, 181 KB)
pdf 59aug BLR P313 Experimental Pushbutton Set (298 downloads) Popular Download (pdf, 592 KB)
pdf 59Aug BLR P313 Push Button 500 Set Dataphone Card Reader (306 downloads) Popular Download (pdf, 453 KB)
pdf 59May BLR P187 Telephone Cords (320 downloads) Popular Download (pdf, 441 KB)
pdf 59Nov BLR P430 Coin Disposal Mechanism (311 downloads) Popular Download (pdf, 898 KB)
pdf 60Dec BLR P470 All Number Calling (427 downloads) Popular Download (pdf, 864 KB)
pdf 60Feb BLR P71 WECo Production 1959 (299 downloads) Popular Download (pdf, 235 KB)
pdf 60Jan BLR P23 Experimental Dial In Handset Phone (340 downloads) Popular Download (pdf, 745 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.

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

30 Latest Additions

Who's online

We have 885 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.