Cyrill Demian

…others give the distinction to Cyril Demian of Vienna, who patented his Accordion in 1829, thus coining the name. A modification of the Handäoline, Demian’s invention comprised a small manual bellows and five keys, although, as Demian noted in a description of the instrument, extra keys could be incorporated into…

…Buschmann of Germany (or by Cyrill Demian of Vienna in 1829) and operates on the same principle as the harmonica except that a bellows substitutes for the breath and buttons or keys open channels to free reeds. Melody is controlled by the right hand and the bass and accompanying chords…