The Step by Step Switch
The Step by Step Switch
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.
- Műfaj: Dokumentum
- Ország: United States
- Rendező:
- Öntvény:
