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发明名称
Board
摘要
申请公布号
US2257687(A)
申请公布日期
1941.09.30
申请号
US19400341551
申请日期
1940.06.20
申请人
HUFFAKER JOHN E
发明人
HUFFAKER JOHN E.
分类号
A63F3/02
主分类号
A63F3/02
代理机构
代理人
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