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发明名称
Drain hole drilling equipment
摘要
申请公布号
US2726847(A)
申请公布日期
1955.12.13
申请号
US19520279554
申请日期
1952.03.31
申请人
OILWELL DRAIN HOLE DRILLING CO.
发明人
MCCUNE JOHN S.;HANKS WILLIAM E.
分类号
E21B7/06;E21B7/08
主分类号
E21B7/06
代理机构
代理人
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地址
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