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telephone exchange

telecommunications system used in public switched telephone networks or in large enterprises

en-US/ˈtɛləˌfoʊn ɪksˈt͡ʃeɪnd͡ʒ/
en-GB/ˈtɛlɪˌfəʊn ɛksˈt͡ʃeɪnd͡ʒ/

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