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发明名称
Ball pitching device
摘要
申请公布号
US2549156(A)
申请公布日期
1951.04.17
申请号
US19480004130
申请日期
1948.01.24
申请人
ATWELL HENRY G
发明人
ATWELL HENRY G.
分类号
A63B69/40
主分类号
A63B69/40
代理机构
代理人
主权项
地址
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