The Step by Step Switch

The Step by Step Switch

The Step by Step Switch


(6 din 35 utilizatori)

0h 08m 1951 HD

Ceas The Step by Step Switch en PortalulTauTV. 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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