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

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

Documents

Select Toggle Title Date Download
pdf AT&T Spec 4159 - Jan22 Maintenance AE Dials Substations (595 downloads) Popular Download (pdf, 2.37 MB)
pdf AT&T Spec 4448 Mar25 - Stations Apparatus for Deaf Subscribers (1702 downloads) Popular Download (pdf, 824 KB)
pdf AT&T Spec 3859 Aug22 Substation Wiring Plans Ocr R (3045 downloads) Popular Download (pdf, 5.42 MB)
pdf AT&T Spec 3859 - Aug22 - Station Wiring Plans (3248 downloads) Popular Download (pdf, 1.78 MB)
pdf AT&T Spec 4566 Feb26 Machine Switching Stations T Ocr R (2942 downloads) Popular Download (pdf, 12.05 MB)
pdf AT&T Spec 4621 - No. 530A Subscriber Set for Outdoor Use - June 1926 (2156 downloads) Popular Download (pdf, 2.34 MB)
pdf AT&T Spec 4590 - No. 50 Coin Collector - Installation - April 1927 (2341 downloads) Popular Download (pdf, 2.59 MB)
pdf AT&T Spec 4588 - May28 CB Manual Stations [LARGE FILE] (2474 downloads) Popular Download (pdf, 21.13 MB)
pdf AT&T Spec 3855 - CP Insert Mar31 Adjustments Substation Apparatus (2915 downloads) Popular Download (pdf, 363 KB)
pdf AT&T Spec 3855 - Mar17 Adjustments Substation Apparatus (3078 downloads) Popular Download (pdf, 4.49 MB)
pdf AT&T Spec 3855 - SuppB Sep30 Adjustments Substation Apparatus (2971 downloads) Popular Download (pdf, 2.11 MB)
pdf AT&T Spec 3855 - SuppC Mar31 Adjustments Substation Apparatus (2769 downloads) Popular Download (pdf, 627 KB)
pdf AT&T Spec 3859 - CP Insert Apr31 Station Wiring Plans (2709 downloads) Popular Download (pdf, 374 KB)
pdf AT&T Spec 3859 - SuppB Sep30 Station Wiring Plans (3275 downloads) Popular Download (pdf, 11.43 MB)
pdf AT&T Spec 4159 - CP Insert Dec24 Maintenance Automatic Electric Dials Substations (2618 downloads) Popular Download (pdf, 342 KB)
pdf AT&T Spec 4159 - Jan22 Maintenance Automatic Electric Dials Substations (3366 downloads) Popular Download (pdf, 4.61 MB)
pdf AT&T Spec 4159 - SuppA Jun24 Maintenance Automatic Electric Dials Substations (2797 downloads) Popular Download (pdf, 675 KB)
pdf AT&T Spec 4170 - Apr22 Substation Private Branch Exchange Protector Installation (3289 downloads) Popular Download (pdf, 11.82 MB)
pdf AT&T Spec 4170 - SuppA Dec24 Substation Private Branch Exchange Protector Installation (2755 downloads) Popular Download (pdf, 2.55 MB)
pdf AT&T Spec 4566 - CP Insert Oct31 Dial Manual CB Stations (2919 downloads) Popular Download (pdf, 1.42 MB)

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