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发明名称
Drill bit.
摘要
申请公布号
OA12369(A)
申请公布日期
2006.04.17
申请号
OA20011000053
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):F21B10/16
主分类号
E21B10/12
代理机构
代理人
主权项
地址
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