An invention for a flexatone occurs in the British Patent Records of 1922 and 1923. In 1924 the 'Flex-a-tone' was patented in the USA by the Playatone Company of New York. "An instrument called the 'Flex-a-tone' was patented in the U.S.A. in 1924 by the Playertone Company of New York. It was introduced as a new instrument, making 'jazz jazzier' and announced as combining the tone effect of musical saw, orchestra bells, and song whistle." "Small sheet of spring steel in a frame with wooden strikers mounted on either side. The player shakes the beater while bending the steel in order to change the pitch."
The instrument was first used in 1920s jazz bands as an effect but is now mainly and rarely used in orchestral music.