Abstract
The Bell System's No. 1 Electronic Switching System (No. 1 ESS) was designed for medium-to-large telephone offices. Its performance has been improved radically since first put into service on May 30, 1965, in Succasunna, New Jersey. By June, 1972, some 250 No. 1 ESS offices were in service equipped with over 4 million customer lines.
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