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The Step by Step Switch 1951 Pub dawb Kev Nkag Mus Siv
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.
Sijhawm Sawv: 8 feeb
Zoo: HD
Tso Tawm: Jul 03, 1951
Ncig Teb Chaws: United States of America
Lus:
Cov ntsiab lus :
