The Step by Step Switch

The Step by Step Switch

The Step by Step Switch


(6 a partir de 35 comercial)

0h 08m 1951 HD

the step by step switch No Overflix. 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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