On 23 May 1829, Accordion patent granted to Cyrill Demian in Vienna, Austrian Empire.
Accordions, are a family of box-shaped musical instruments of the bellows-driven free-reed aerophone type, colloquially referred to as a squeezebox. A person who plays the accordion is called an accordionist. The concertina and bandoneón are related; the harmonium and American reed organ are in the same family.
Cyrill Demian, was an Austrian inventor of Romanian origin who made his living as an organ and piano maker with his two sons, Karl and Guido, On May 6, 1829, Cyrill and his sons presented a new instrument to the authorities for patent - the accordion. The patent was officially granted on May 23, 1829.
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