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发明名称
Drill bit
摘要
申请公布号
GB0113771(D0)
申请公布日期
2001.07.25
申请号
GB20010013771
申请日期
2001.06.06
申请人
SMITH INTERNATIONAL INC
发明人
分类号
E21B10/16;E21B10/18;E21B10/52;E21B17/10
主分类号
E21B10/16
代理机构
代理人
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地址
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