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The Step by Step Switch | EV01 - Reviews, Trailers & Showtimes

Poster for The Step by Step Switch

The Step by Step Switch

HD

0

8 min

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.

Country:

US

Genre:

Documentary

Released:

1951-07-03

Languages:

N/A

Companies:

Audio Productions Inc.