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发明名称
Earth boring apparatus
摘要
申请公布号
US2719698(A)
申请公布日期
1955.10.04
申请号
US19510208874
申请日期
1951.02.01
申请人
DARIN & ARMSTRONG, INCORPORATED
发明人
DARIN PETER C.;ALLEN LE ROY E.
分类号
E21B7/00;E21B11/04
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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