The Step by Step Switch

The Step by Step Switch

The Step by Step Switch


(6 tól től 35 felhasználók)

0h 08m 1951 HD

Nézze meg a The Step by Step Switch Teljes Film Magyarul. 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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