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

AT&T Spec 4159 - Jan22 Maintenance AE Dials Substations

paul-f@verizon.net (Paul F) — Sun, 05 Mar 2023 19:57:21 -0800

16 pages. January 1922. Cleaned up scan of this classic specification, including parts inspection and dial speed adjustment. Contributed by Jeff Lamb. Bookmarked by Paul Fassbender.

AT&T Spec 4448 Mar25 - Stations Apparatus for Deaf Subscribers

paul-f@verizon.net (Paul F) — Thu, 21 Mar 2019 18:17:13 -0700

Includes: Double Head Receiver Installations; Temporary Amplifier Installations w/ #27-A Amplifier; and Permanent Amplifier Installations w/ #23-A Amplifier and #6013-A Key. ATT. Contributed by Steve Cichorsky. Processed by Remco Enthoven and Paul Fassbender.

AT&T Spec 3859 Aug22 Substation Wiring Plans Ocr R

(Anonymous) — Sat, 16 Mar 2013 15:32:37 -0700

Contributed by Steve Cichorsky.

AT&T Spec 3859 - Aug22 - Station Wiring Plans

(Anonymous) — Thu, 10 May 2012 14:11:16 -0700

Specification 3859, August 1922. Contributed by Steve Cichorsky.

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

(Anonymous) — Sun, 22 Jan 2012 06:38:51 -0800

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.

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

(Anonymous) — Sun, 18 Dec 2011 06:40:12 -0800

Rescanned for clarity. Includes wiring diagram. Contributed by Steve Cichorsky.

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

(Anonymous) — Sun, 18 Dec 2011 06:37:21 -0800

Rescanned for clarity. Replaced Spec 3857 and part of 4160. Contributed by Steve Cichorsky.

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

(Anonymous) — Sat, 19 Nov 2011 08:45:02 -0800

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.

AT&T Spec 3855 - CP Insert Mar31 Adjustments Substation Apparatus