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发明名称
Combination well driving and boring tool
摘要
申请公布号
US2214970(A)
申请公布日期
1940.09.17
申请号
US19390269971
申请日期
1939.04.25
申请人
JOHN MOONEY
发明人
MOONEY JOHN
分类号
E21B4/06;E21B4/10;E21B49/02
主分类号
E21B4/06
代理机构
代理人
主权项
地址
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