Manual / Guide · n.d.

No. 1 Step-by-Step Training Manual, Vol II: Sequence Charts and Operational Sketches

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Sequence charts and sketches tracing call progress through Bell No.1 SxS.

Author

Bell System

Year

n.d.

Type

Manual / Guide

Credit

Telephone Collectors International (TCI) Library, telephonecollectors.info (retrieved via Internet Archive Wayback Machine)

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