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发明名称
Control apparatus for drilling wells
摘要
申请公布号
US2133016(A)
申请公布日期
1938.10.11
申请号
US19340756696
申请日期
1934.12.08
申请人
DRILLING AND EXPLORATION COMPANY, INC.
发明人
BRANTLY JOHN E.
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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