The Step by Step Switch 1951
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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.
- Title: The Step by Step Switch
- Year: 1951
- Genre: Documentary
- Country: United States of America
- Studio: Audio Productions Inc.
- Director:
- Cast:
- Crew:
- Keyword:
- Release: Jul 03, 1951
- Runtime: 8 minutes
- IMDb: 0.00 / 10 by 0 users
- Popularity: 0
- Budget: $0
- Revenue: $0
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