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Also from Wikipedia:

“Accordina drawing from US Patent 2461806Public Domain André Borel – U.S. Patent 2,461,806 for “Chromatic Harmonicon” (issued Feb. 15, 1949) Patent drawing for accordina

Drawing from U.S. Patent 2,461,806 describing André Borel’s improved “chromatic harmonicon” with chromatic button accordion keyboard. This instrument, a type of melodica, is better known as the accordion.”

The drawing is included on the Wikipedia.com website.

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