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发明名称
Improvements in or relating to steerable rotary drilling systems
摘要
申请公布号
GB9817935(D0)
申请公布日期
1998.10.14
申请号
GB19980017935
申请日期
1996.02.14
申请人
CAMCO DRILLING GROUP LIMITED
发明人
分类号
E21B7/06
主分类号
E21B7/06
代理机构
代理人
主权项
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