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The chalumeau is the clarinet's predecessor. It had a range of one and a half octaves.
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Johann Christopher Denner and his son Jacob made some major adjustments to the chalumeau, including the addition of the register key; this allowed for a wider and higher range.
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More improvements were made, including more keys, a different cut, and different tone holes. The 13-hole model was popular until the late 1800's.
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This system is currently the most well-known and widely used system. It is used on the oboe and saxophone, as well.
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The Boehm clarinet includes 17 keys, moveable rings, needle springs, and a wooden body, hence why it is called a "woodwind" instrument.