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发明名称
Element for a rotating drill string
摘要
申请公布号
EP0866209(B1)
申请公布日期
2003.06.04
申请号
EP19980400538
申请日期
1998.03.06
申请人
S.M.F. INTERNATIONAL
发明人
BOULET, JEAN GILBERT
分类号
E21B17/10;E21B17/22;(IPC1-7):E21B17/22
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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