The Step by Step Switch

The Step by Step Switch

1951
8m
0.0

0.0/10

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Documentary
Overview

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.

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Status: Released

Language: EN

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Production Information

Production Companies
Audio Productions Inc.
Production Countries
United States of America

Quick Facts

Release Date July 3, 1951
Status Released
Language EN
IMDb ID tt21868596

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