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发明名称
Method of and apparatus for forming wells
摘要
申请公布号
US2471695(A)
申请公布日期
1949.05.31
申请号
US19460718864
申请日期
1946.12.27
申请人
MCCULLOUGH IRA J
发明人
MCCULLOUGH IRA J.
分类号
E21B7/15;E21B17/00;E21B17/18
主分类号
E21B7/15
代理机构
代理人
主权项
地址
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