Granted in 1968 to Henry Kaech of Biel, Switzerland, this design is for a harmonica-like instrument with a sliding mouthpiece. As well as sliding the mouthpiece along the front of the instrument, notes are also selected by the four buttons on the instrument, one at each upper and lower front corner. These buttons control how air flows through the mouthpiece, directing it to different reeds in the body of the instrument:
The inventor claims that this arrangement allows for a large number of reeds to be accommodated in a small area, adding that other embodiments of the design can be built, with more or less buttons to control the airflow through the mouthpiece.
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