Фильм1951США

The Step by Step Switch

Name: The Step by Step Switch
Genre: Документальный
Released: 1951-07-03
Duration: 8 min

IMDb—TMDb—

Год1951

СтранаСША

ЖанрДокументальный

Длительность8 мин.

Премьера03.07.1951

О фильме

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.