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发明名称
Well drilling apparatus
摘要
申请公布号
US2717762(A)
申请公布日期
1955.09.13
申请号
US19510252627
申请日期
1951.10.23
申请人
MCGREGOR JAMES M
发明人
MCGREGOR JAMES M.
分类号
E21B4/02;E21B10/18;E21B21/16
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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