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发明名称
FRICTION-REDUCING DRILL PIPE COMPONENT
摘要
申请公布号
EP0843773(B1)
申请公布日期
2000.10.18
申请号
EP19960929385
申请日期
1996.08.30
申请人
DRILLTECH SERVICES (ASIA) PTE LIMITED
发明人
APPLETON, ROBERT, PATRICK;RASTEGAR, GHOLAM, HOSSEIN
分类号
E21B17/046;E21B17/10;(IPC1-7):E21B17/10
主分类号
E21B17/046
代理机构
代理人
主权项
地址
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