发明名称 Batting aid
摘要 The batting aid is constructed with a shoulder piece for fitting against a shoulder and a jaw piece for fitting against a jaw of a batter. The jaw piece is resiliently connected to the shoulder piece to impede motion of the jaw piece towards the shoulder piece when in use. The batting aid serves to aid a batter in maintaining eye-to-ball contact during a swing.
申请公布号 US4300765(A) 申请公布日期 1981.11.17
申请号 US19780974242 申请日期 1978.12.29
申请人 STRINGHAM, RONALD L. 发明人 STRINGHAM, RONALD L.
分类号 A63B69/00;(IPC1-7):A63B69/40 主分类号 A63B69/00
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