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发明名称
Slagborehode og fremgangsmate for boring
摘要
申请公布号
NO20041575(A)
申请公布日期
2004.04.19
申请号
NO20040001575
申请日期
2004.04.19
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV
发明人
ZIJSLING DJURRE HANS;KRIESELS PETRUS CORNELIS
分类号
E21B7/00;E21B10/40;(IPC1-7):E21B10/36;E21B10/62
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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