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A concertina is a free-reed musical instrument, like the various accordions and the harmonica. It consists of expanding and contracting bellows, with buttons usually on both ends, unlike accordion buttons, which are on the front.
The concertina... Wikipedia
Inventor(s): Sir Charles Wheatstone, Carl Friedrich Uhlig
Related instruments: Bandoneon, English concertina, Anglo concertina, and more
Invention date: 1829
Hornbostel–Sachs classification: 412.132; (Free-reed aerophone)