Inventions by Leon Theremin

The theremin (; originally known as the ætherphone, etherphone, thereminophone or termenvox/thereminvox) is an electronic musical instrument controlled without physical contact by the performer (who is known as a thereminist). It is named after its inventor, Leon Theremin, who patented the device in 1928.

Audio bug formerly hidden in Moscow US embassy

surveillance device that uses a laser beam to detect sound vibrations in a distant object

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