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The Step by Step Switch
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.
Runtime: 8 minutes
Release: Jul 03, 1951
IMDb: 0.00/10 by 0 users
Popularity: 0
Country: United States of America
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Budget: 0
Revenue: 0
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