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经营范围
发明名称
Rock drill
摘要
申请公布号
US2643641(A)
申请公布日期
1953.06.30
申请号
US19500161767
申请日期
1950.05.13
申请人
GARDNER-DENVER COMPANY
发明人
HUFFMAN MERVIN C.
分类号
E21B21/16
主分类号
E21B21/16
代理机构
代理人
主权项
地址
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