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Alexandre Debain (1809-1877)

"Alexandre-François Debain (6 July 1809 – 3 December 1877) was a French inventor who developed the harmonium. He made a new action system, in which, when depressing a note on the keyboard, a valve opened thereby emitting sound from the instrument. He patented it in Paris in 1842." - (en.wikipedia.org 24.05.2021)

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Created Alexandre Debain (1809-1877)