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发明名称
Drill bit.
摘要
申请公布号
OA11327(A)
申请公布日期
2003.12.09
申请号
OA20001000056
申请日期
2000.02.28
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
发明人
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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