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The Pentaconta Crossbar and Exchange
ial telephone switching system was developed in 1953 by the International Telephone and Telegraph Company (ITT). The basic switch was patterned after those from Western Electric, the Swedish Nay Autotelefon Betulander and the LM Ericsson companies’ crossbars (developed starting in 1915).
The basic switch was patterned after those from Western Electric, the Swedish Nay Autotelefon Betulander and the LM Ericsson companies’ crossbars (developed starting in 1915). Others were installed during the next four years in France, Chile, Brazil, and Argentina, the largest being at Bergamo, Italy, with 17,000 subscribers' lines. 1- JACQUES P. BASSET and PIERRE CAMUSITT, ITT Technical Journal, 1000B Pentaconta Crossbar Switching System, Volume 38, Number 2, 1963
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