Lev Sergeyevich Termen ( Russian : Ле́в Серге́евич Терме́н ) ( 27 August ( O.S. 15 August ) 1896 - 3 November 1993 ) , or Léon Theremin in The United States , was a Russian and Soviet inventor .
Léon Theremin ( born Lev Sergeyevich Termen , Russian : Лев Сергеевич Термен ) ( August 15 , 1896 - November 3 , 1993 ) was a Russian inventor .