Granted to Otto Hermann Böhm in 1929, this design worked in a very similar way to the Oefinger/Butler patent (US Patent 443607) and was used in the Music King chromatic. Above the blow reedplate was a second plate with slots that allowed alternate reeds to sound. Pushing the button at the end of the instrument moved the slotted plate to allow the other reeds to sound. The draw notes worked similarly, except in this case it was the slotted plate that remained stationary and the reedplate that slid from side to side:
Otto Hermann Böhm was the youngest son of F. A. Böhm and grew up in the family harmonica business. He was awarded several patents for innovative harmonica design, including German Patent 703133 for another chromatic harmonica.
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