The Step by Step Switch

The Step by Step Switch

The Step by Step Switch


(6 from 35 users)

0h 08m 1951 HD

Watch the step by step switch FMovies. 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.

The Step by Step Switch (1951)
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