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The 5ESS Switching System is a Class 5 telephone electronic switching system developed by Western Electric for the American Telephone and Telegraph Company (AT&T) and the Bell System in the United States. It came into service in 1982 and the last unit was produced in 2003.[1]
- ^ "Western Electric/Lucent Modern Telephone Switching Systems". Telephone World. Retrieved January 27, 2022.
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