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Portable bellows-operated musical instrument. The first concertina was patented by Sir Charles Wheatstone in London in 1829, and he later produced an instrument with full chromatic capacity. Like the accordion, its sound is produced by free reeds, but it uses buttons rather than keys. The very similar Argentinian bandoneon is square rather than hexagonal.
This entry comes from Encyclopædia Britannica Concise. For the full entry on concertina, visit Britannica.com.