pdf BTL History: Evolution of Switching in the Bell System - extract Popular

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EandS Bell System- Step-by-Step.pdf

BTL History: Evolution of Switching in the Bell System - extract

From A History of Engineering and Science in the Bell System: Switching Technology. 16-page extract titled Step by Step Improvements (pages 22-37). WE installed AE switches until production started in 1926. SxS.

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