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发明名称
Drill bit
摘要
申请公布号
GB0003248(D0)
申请公布日期
2000.04.05
申请号
GB20000003248
申请日期
1998.08.28
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
发明人
分类号
E21B10/12;E21B10/16
主分类号
E21B10/12
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