The Step by Step Switch
Movie
1951-07-03
8m
Documentary
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.
Status
Released
Released
1951-07-03
Runtime
8m
Studio
Country
United States of America
Links
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Metadata from the source database.
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