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发明名称
ROTARY DRILL BIT
摘要
申请公布号
GB2185506(A)
申请公布日期
1987.07.22
申请号
GB19860001360
申请日期
1986.01.21
申请人
* SHELL INTERNATIONALE RESEARCH MAATSHAPPIJ B V
发明人
DJURRE HANS * ZIJSLING
分类号
E21B10/60;(IPC1-7):E21B10/60
主分类号
E21B10/60
代理机构
代理人
主权项
地址
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