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Lev Sergeyevich Termen ( ; 27 August [O.S. 15 August] 1896 – 3 November 1993), better known as Leon Theremin, was a Russian inventor, most famous for his invention of the theremin, one of the first electronic musical instruments and the first to be mass-produced. He also worked on early television research. His secret listening device, "The Thing", hung for seven years in plain... Wikipedia