French horns with four finger valves and one change horn valve, instead of the standard three finger valves and one change horn valve enable play in twelve keys, as well as twelve tones
http://www.freepatentsonline.com/5076130.html
French horns with four finger valves and one change horn valve, instead of the standard three finger valves and one change horn valve enable play in twelve keys, as well as twelve tones
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