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发明名称
Drill bit
摘要
申请公布号
GB2301386(B)
申请公布日期
1997.05.14
申请号
GB19960016784
申请日期
1994.01.25
申请人
* BAKER HUGHES INCORPORATED
发明人
GORDON A * TIBBITTS
分类号
E21B10/32;E21B10/62;(IPC1-7):E21B10/62
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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