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经营范围
发明名称
Drill bit
摘要
申请公布号
GB2384505(A)
申请公布日期
2003.07.30
申请号
GB20030004377
申请日期
2001.09.06
申请人
* SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
发明人
FREDERIK * DAMHOF;DJURRE HANS * ZIJSLING
分类号
E21B10/12;E21B10/16;(IPC1-7):E21B10/16
主分类号
E21B10/12
代理机构
代理人
主权项
地址
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