| 摘要 |
A musical instrument providing a base board, an elongated tone board mounted on the base board, the tone board having a first portion made of a material that is not ferro-magnetic and a second portion made of a ferro-magnetic material, a sensor mounted on the base board and providing a flux path and an output terminal, and a damper located between the tone board and the base board for isolating vibrations in the tone board from the sensor.
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