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发明名称
Method and apparatus for directional drilling in underground rock formations
摘要
申请公布号
GB2143879(A)
申请公布日期
1985.02.20
申请号
GB19840017849
申请日期
1984.07.13
申请人
* CHRISTENSEN INC
发明人
RAINER * JURGENS
分类号
E21B4/02;E21B7/06;(IPC1-7):E21B7/06
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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