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Home › Gradually progressive bore BB-flat, CC, E-flat, F, or B-flat valved musical wind instrument and valved B-flat/F inverted double musical wind instrument

Gradually progressive bore BB-flat, CC, E-flat, F, or B-flat valved musical wind instrument and valved B-flat/F inverted double musical wind instrument

US Patent 7161077 · Granted Jan 9, 2007

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