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发明名称
DRILL BIT
摘要
申请公布号
CA2570160(A1)
申请公布日期
2008.06.06
申请号
CA20062570160
申请日期
2006.12.06
申请人
GEMSTAR PDC CORP.
发明人
HAYES, JOHN P.;KRISTENSEN, HENRY;POOLE, DANIEL B.
分类号
E21B10/43;E21B10/42;E21B10/54;E21B10/55
主分类号
E21B10/43
代理机构
代理人
主权项
地址
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