The Step by Step Switch (1951)
This AT&T informational film describes in detail how step-by-step switches work, and demonstrates their real-time operation by calling a 5-digit phone number from another dial telephone.
Genres: Documentary, Short
Keywords: mdblist.imdb-short, imdb.educational-film, imdb.ephemeral-film, imdb.narrated, imdb.rotary-dial-telephone, imdb.technology, imdb.telephone-switching-equipment, imdb.1950s
Production Companies: Audio Productions Inc.
Country: United States
Production Country:
United States
Languages:
English
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