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摘要
申请公布号
US2187310(A)
申请公布日期
1940.01.16
申请号
US19380241795
申请日期
1938.11.22
申请人
DUQUESNE MINE SUPPLY COMPANY
发明人
GENTER ALBERT H.
分类号
B60M1/18
主分类号
B60M1/18
代理机构
代理人
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