It was invented around the 1920s, and the inventor, Léon Theremin -- he also was a musician besides an inventor -- he came up with the idea for making the theremin, I think, when he was working on some shortwave radios.
To ap 1920. gadu izgudroja Ļevs Termens. Viņš bija ne tikai izgudrotājs, bet arī mūziķis. Viņš nāca klajā ar izgudroto termenvoksu, šķiet, viņam izstrādājot īsviļņu radio.