发明名称 Batting practice device
摘要 This invention relates to a batting practice device for teaching and improving a person's batting and switch hitting techniques. More particularly, this invention relates to a ball tethered at the end of a rope wherein the opposing end of the rope is rotatably attached to a vertical member thereby allowing the ball to rotate continuously about the vertical member.
申请公布号 US5531438(A) 申请公布日期 1996.07.02
申请号 US19940329490 申请日期 1994.10.26
申请人 CORLEY, DERYL 发明人 CORLEY, DERYL
分类号 A63B69/00;A63B69/22;A63B69/38;(IPC1-7):A63B69/00 主分类号 A63B69/00
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