Folder AT&T Specifications (pre-BSP) (by Doc #)

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4-digit all numeric codes, used before about 1930.

Documents

pdf AT&T Spec 4566 Feb26 Machine Switching Stations T Ocr R Popular

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Spec4566_Feb26_Machine_Switching_Stations T ocr r.pdf

AT&T Spec 4566 Feb26 Machine Switching Stations T Ocr R
116 pages. Replaced spec 4160. Covers 51AL, 51CM, 51C, 51CN, desk stands, D-75959 test set, 7A-type coin collector, subsets - 392-type, 534-type, 553-type and 554-type - plus wiring diagrams. Contributed by Chuck Hensley.

[Original Archived]  OCR / Size reduction by Clint Gilliland.

pdf AT&T Spec 4588 - May28 CB Manual Stations [LARGE FILE] Popular

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Spec4588_May28_CB_Manual_Stations.pdf

AT&T Spec 4588 - May28 CB Manual Stations  [LARGE FILE]
Replaced parts of specs 3851 and 3854. Covers 40AL, 40CM, 51AL, 51CM, 51CN, 52AB desk sets, 7J-type coin collector, subsets - 392-type, 533-type, 534-type, 553-type and 554-type - plus wiring diagrams. Contributed by Chuck Hensley.

pdf AT&T Spec 4590 - No. 50 Coin Collector - Installation - April 1927 Popular

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Spec4590_Apr27_No50CoinCollectorInst_PageThumbnails2.pdf

AT&T Spec 4590 - No. 50 Coin Collector - Installation - April 1927
Rescanned for clarity.  Replaced Spec 3857 and part of 4160.  Contributed by Steve Cichorsky.

pdf AT&T Spec 4621 - No. 530A Subscriber Set for Outdoor Use - June 1926 Popular

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Spec4621_Jun26_530A_OutdoorSubset_s2.pdf

AT&T Spec 4621 - No. 530A Subscriber Set for Outdoor Use - June 1926
Rescanned for clarity. Includes wiring diagram.  Contributed by Steve Cichorsky.

pdf AT&T Spec 4800 - Telephone Directory Install Tl Popular

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ATTSpec4800TelDirInstall_tl.pdf

pdf AT&T Spec 4810 - Stations Hand Telephone Sets Popular

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Spec4810_Dec27_StationHandTelSets_ABCmountings.pdf

AT&T Spec 4810 - Stations Hand Telephone Sets

A.T.&T. Specifications 4810, December 1927, Replacing Spec 4732 and Supplement A, 36 pages.
Includes Cording, Connections and Tests for E1A and E1B handserts used on A, B and C handset mountings, including A1-type, A2-type, A3-type, B1-type, B2-type, B3-type and C1-type mountings.

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Recent Contributors

Thanks for new documents from Chuck Hensley, John Gilbert, Chuck Batson, Alan David, Steve Flocke, Paul Wills, Dave Gruger, Jim Prather, John Stancliff, Sam Etler, John Novack, Clint Gilliland, Steve Cichorsky and Paul Fassbender.

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