The Bell Telephone System

The Bell Telephone System

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Fernsprechtechnik, Telefonie (Technik).After exhaustive experiments, an automatic switchboard which met the exacting service conditions was developed and introduced for general use in the Bell System in the early 1920a#39;s. Like the manual boards, there have been improvementsanbsp;...

Title:The Bell Telephone System
Author:Athur W. Page
Publisher: - 1941


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