The Step by Step Switch

Guarda the step by step switch su StreamingCommunity. 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.

Genere: Documentario
Nazione: United States
Direttore:
Cast:

GuardaQualità: 4K-HD
Scarica Qualità: 4K-HD

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The Step by Step Switch

The Step by Step Switch

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