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发明名称
A REMOVABLE GUIDE MEMBER FOR GUIDING DRILL STRING COMPONENTS IN A DRILL HOLE
摘要
申请公布号
KR20000064669(A)
申请公布日期
2000.11.06
申请号
KR1019980707385
申请日期
1998.09.18
申请人
发明人
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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