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The Step by Step Switch

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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.

Details

Status: Released
Release date: July 3, 1951
Original language: English
Countries: United States of America
Production: Audio Productions Inc.
Budget: Not recorded
Revenue: Not recorded
IMDb: tt21868596