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发明名称
Directional drilling device
摘要
申请公布号
US2119095(A)
申请公布日期
1938.05.31
申请号
US19370128948
申请日期
1937.03.04
申请人
BRUMMETT CHARLES N
发明人
BRUMMETT CHARLES N.
分类号
E21B7/06;E21B7/08;E21B47/08
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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