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The Step by Step Switch 1951 Fergees Unbeheinde tagong
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.
Runtime: 8 minuten
Kwaliteit: HD
Loslitte: Jul 03, 1951
Lân: United States of America
Taal:
Keyword :
