| 摘要 |
A sounding device for attachment to the strings of a tennis racket which provides a unique audible sound which indicates where on the tennis racket the ball is struck by the racket. The device includes a frame for clamping a thin plastic diaphragm against the surface of the strings in the central region of the racket. The frame includes a sounding board which extends parallel to the diaphragm for amplifying the sound produced by the diaphragm when the adjacent strings are struck by the tennis ball.
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