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经营范围
发明名称
Air percussion drilling assembly for directional drilling applications
摘要
申请公布号
EP0580056(B1)
申请公布日期
1997.02.12
申请号
EP19930111146
申请日期
1993.07.12
申请人
SMITH INTERNATIONAL, INC.
发明人
JOHNS, ROGER P.;OLIVER, MICHAEL S.;BUI, HUY D.
分类号
E21B4/00;E21B4/14;E21B4/16;(IPC1-7):E21B4/16
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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