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发明名称
Ball impellers
摘要
申请公布号
US2719716(A)
申请公布日期
1955.10.04
申请号
US19520289952
申请日期
1952.05.26
申请人
发明人
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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