

A little later, both German Carl Friedrich Uhlig (1834) and Englishman Sir Charles Wheatstone (1844) patented the concertina.

The first patent for an instrument called an “accordion” was filed in 1829 by Cyrill Demian in Vienna, Austria. Another difference is that most accordions have bass capable of playing an entire chord, whereas concertina buttons play one note at a time. Accordion buttons, called “bass,” are pushed perpendicular to the bellows. Concertina buttons are pushed into the instruments, traveling in the same direction as the bellows. The most obvious is the way the buttons are played. Although similar in principle, there are several internal and external differences between concertinas and accordions.
