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发明名称
Retningsboreapparat
摘要
申请公布号
DK173482(B1)
申请公布日期
2000.12.18
申请号
DK19910000805
申请日期
1991.04.30
申请人
DIRECTIONAL DRILLING DYNAMICS LTD.
发明人
NOBLE, JAMES BAIN
分类号
E21B4/20;E21B7/06;E21B7/08;(IPC1-7):E21B7/06
主分类号
E21B4/20
代理机构
代理人
主权项
地址
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