Cyrill Demian

Cyrill Demian (1772–1849) was an Austrian-Armenian inventor, Organ maker, and piano maker who on May 6, 1829, along with his sons Karl and Guido, would patent the accordion. This patent would later be granted on May 23, 1829.[1]

References
  1. "The Classical Free-Reed, Inc. Demian's Accordion Patent". web.archive.org. 2009-06-19. Archived from the original on 2009-06-19. Retrieved 2024-01-15.
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