duplexer

noun
du·​plex·​er | \ˈdü-ˌplek-sər also ˈdyü- \

Definition of duplexer 

: a switching device that permits alternate transmission and reception with the same radio antenna

First Known Use of duplexer

circa 1932, in the meaning defined above

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The first known use of duplexer was circa 1932

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