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The Step by Step Switch

Documental8 minutos1951United States

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.

Director
Emitir

0IMDb

10% progress

0:00 / 00:08:00

Calidad:

Ultra HD 4K - 1080pHD - 720pHD - 480p

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