Folder BSP Categories by early Letter Code (by Doc #)

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Alphanumeric codes, used from about 1930 until the early 1960s.

Categories

Folder AA-Series - Equipment Engineering
Folder B-Series - PBX Installation and Maintenance
Folder C Series - Station Installation and Maintenance
Folder G-Series - Outside Plant
Folder M-Series - Plant

Documents

Toggle Title Date Download
pdf 4A 4M Xbar SC-OS-RM (4606 downloads) Popular Download (pdf, 21.69 MB)
pdf A128.819 I5 (4256 downloads) Popular Download (pdf, 381 KB)
pdf A128.820 Toll Switchboard No. 3C or 3CL, Issue 1, April 1950 - Charts (4753 downloads) Popular Download (pdf, 4.07 MB)
pdf A128.820 Toll Switchboard No. 3C or 3CL, Issue 1, April 1950 - Checking List (4078 downloads) Popular Download (pdf, 104 KB)
pdf A199.850 iA Apr61 - CO Maintenance Telephone Directory (2911 downloads) Popular Download (pdf, 6.50 MB)
pdf A217.122 I7 May58 - Selector Oper Test Using Test Set Step A218.220 A252.001 Ocr R (2972 downloads) Popular Download (pdf, 407 KB)
pdf A438.675 i2D Apr40 - Switches 300 301 302 303-types (2205 downloads) Popular Download (pdf, 17.66 MB)
pdf A702.625 I1 Mar63 23A Trans Measuring Set Desc E40.208 Ocr (3125 downloads) Popular Download (pdf, 632 KB)
pdf A837.001 i1 Jun 1932 General Description No. 12 Switchboard (976 downloads) Popular Download (pdf, 3.35 MB)
pdf A837.002 i1 Apr 1936 General Description 640-line and 1440-line no. 12 Switchboard (1099 downloads) Popular Download (pdf, 4.03 MB)
pdf AB43.910-3 AppA IA Jul50 500-Set Loop Design Tables 1950 Ocr (3039 downloads) Popular Download (pdf, 640 KB)
pdf AB46.372A i1 Sep50 - 372A Cold Cathode Tube (2061 downloads) Popular Download (pdf, 78 KB)
pdf AB46.425A i4 Jun62 - 425A Electron Tube (1913 downloads) Popular Download (pdf, 117 KB)
pdf AB46.426A i4 Jan62 - 426A Electron Tube (2209 downloads) Popular Download (pdf, 102 KB)
pdf AB47.007 I1 Mar56 Bell System Capacitors (4286 downloads) Popular Download (pdf, 3.27 MB)
pdf E34.061 I5 K1 Carrier Telephone Terminal R (2607 downloads) Popular Download (pdf, 1.16 MB)
pdf E44.062 I1 Type K Carrier Ocr R (2492 downloads) Popular Download (pdf, 2.16 MB)
pdf H-85950-Office-Alarm-Circuit (4316 downloads) Popular Download (pdf, 4.47 MB)
pdf H-series "Buildings" BSP Collection 1932-60 (1556 downloads) Popular Download (pdf, 21.54 MB)

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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.

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