| 摘要 |
A Briccialdi B flat thumb key mechanism for a woodwind instrument having a B key including a cup part and a lever part and movable around an axle, and a lever rockingly movable around the same axle for transferring a rocking motion to the B key for closing same and to a B flat key also for closing same, with the axle defining an angle of 20 DEG -75 DEG relative to a longitudinal axis of the instrument.
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