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

Select Toggle Title Date Download
pdf AB22.066.1 i1 May52 - 500 Set Description (213 downloads) Popular Download (pdf, 3.06 MB)
pdf H-series Sweeping BSPs from 1952-59 (1126 downloads) Popular Download (pdf, 860 KB)
pdf A837.002 i1 Apr 1936 General Description 640-line and 1440-line no. 12 Switchboard (2135 downloads) Popular Download (pdf, 4.03 MB)
pdf A837.001 i1 Jun 1932 General Description No. 12 Switchboard (2021 downloads) Popular Download (pdf, 3.35 MB)
pdf H-series "Buildings" BSP Collection 1932-60 (2748 downloads) Popular Download (pdf, 21.55 MB)
pdf A438.675 i2D Apr40 - Switches 300 301 302 303-types (3303 downloads) Popular Download (pdf, 17.66 MB)
pdf A199.850 iA Apr61 - CO Maintenance Telephone Directory (4142 downloads) Popular Download (pdf, 6.50 MB)
pdf AB46.426A i4 Jan62 - 426A Electron Tube (3290 downloads) Popular Download (pdf, 102 KB)
pdf AB46.425A i4 Jun62 - 425A Electron Tube (2879 downloads) Popular Download (pdf, 117 KB)
pdf AB46.372A i1 Sep50 - 372A Cold Cathode Tube (3141 downloads) Popular Download (pdf, 78 KB)
pdf E34.061 I5 K1 Carrier Telephone Terminal R (3965 downloads) Popular Download (pdf, 1.16 MB)
pdf E44.062 I1 Type K Carrier Ocr R (3903 downloads) Popular Download (pdf, 2.16 MB)
pdf A217.122 I7 May58 - Selector Oper Test Using Test Set Step A218.220 A252.001 Ocr R (4067 downloads) Popular Download (pdf, 407 KB)
pdf A702.625 I1 Mar63 23A Trans Measuring Set Desc E40.208 Ocr (4306 downloads) Popular Download (pdf, 632 KB)
pdf AB43.910-3 AppA IA Jul50 500-Set Loop Design Tables 1950 Ocr (4152 downloads) Popular Download (pdf, 640 KB)
pdf AB47.007 I1 Mar56 Bell System Capacitors (5635 downloads) Popular Download (pdf, 3.27 MB)
pdf H-85950-Office-Alarm-Circuit (5564 downloads) Popular Download (pdf, 4.47 MB)
pdf 4A 4M Xbar SC-OS-RM (5906 downloads) Popular Download (pdf, 21.69 MB)
pdf A128.819 I5 (5382 downloads) Popular Download (pdf, 381 KB)
pdf A128.820 Toll Switchboard No. 3C or 3CL, Issue 1, April 1950 - Charts (6103 downloads) Popular Download (pdf, 4.07 MB)

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Recent Contributors

Thanks for new documents from Steph Kerman, Jason Anderson, Doug Duffy, Bruce Patterson, Jeremy Walters, Nick Hunseder, Ed Burnett, Ralph Meyer, Shane Young, David Brown, the Connections Museum, Paul Fassbender, Lou Maffei, Rick Thoensen, Sheila Flory, Tom Hesson, Jim Hurtle, Ed Palazzo, Remco Enthoven, Jon Kolger, Paul Ivester, Len Hicken, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), Rick Walsh, and Jeff Lamb.

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