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经营范围
发明名称
Two-cone bit with non-opposite cones.
摘要
申请公布号
EP0395572(B1)
申请公布日期
1993.12.15
申请号
EP19900630094
申请日期
1990.04.26
申请人
BAKER HUGHES INCORPORATED
发明人
PESSIER, RUDOLF CARL OTTO
分类号
E21B10/08;(IPC1-7):E21B10/08
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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