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发明名称
Ball
摘要
申请公布号
US2219154(A)
申请公布日期
1940.10.22
申请号
US19380213339
申请日期
1938.06.13
申请人
JOHN WAHLBERG
发明人
WAHLBERG JOHN
分类号
A63F9/04
主分类号
A63F9/04
代理机构
代理人
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地址
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