发明名称 Tennis teaching apparatus
摘要 The present invention provides an apparatus useful in teaching tennis skills to a player and has a wand having a tennis ball attached thereto pivotally mounted on a base so as to flex when the ball is struck by a tennis racket and also has a damper assembly extending between the wand and the base so as to rapidly damp out oscillations of the wand due to the tennis ball being struck by a tennis racket.
申请公布号 US5685542(A) 申请公布日期 1997.11.11
申请号 US19940258825 申请日期 1994.06.13
申请人 WEIS, RAYMOND P. 发明人 WEIS, RAYMOND P.
分类号 A63B69/00;A63B69/38;A63B71/02;(IPC1-7):A63B61/00 主分类号 A63B69/00
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