Director Telephone System - Director Systems in The US

Director Systems in The US

In the United States, most large cities used the Panel, Number 1 Crossbar, or Number 5 Crossbar Switching Systems rather than step-by-step equipment. Los Angeles being a small town early in the 20th century (and partly served by an independent telephone company) grew up to be a major exception. Before the advent of electronic switching systems, directors were commonly used in areas of the city served by GTE.

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