发明名称 Batting baseball tee
摘要 A batting baseball tee comprised of a self-righting, semi-spherical weighted bottom portion with an axially upstanding post removably fixed thereto, terminating at its upper end with an inverted conical helical spring attached thereto for the reception of a ball forming a batting target.
申请公布号 US4176838(A) 申请公布日期 1979.12.04
申请号 US19770842942 申请日期 1977.10.17
申请人 GRIFFIN, JACQULYN G 发明人 GRIFFIN, JACQULYN G
分类号 A63B69/00;(IPC1-7):A63B69/40 主分类号 A63B69/00
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