Invention Grant
US08771108B2 Training device for improving a tennis players swing 失效
用于改善网球运动员挥杆的训练装置

Training device for improving a tennis players swing
Abstract:
A training device which includes a face with a first region and a second region, said first region adapted to provide an first auditory output when struck by a tennis ball and said second region adapted to provide a second auditory output when struck by a tennis ball, wherein said first auditory output and said second auditory output are different, a circumferentially grooved region adjacent said face, and a ringlet engageable with said grooved region.
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