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发明名称
FLEXIBLE SINKER BAR ASSEMBLIES
摘要
申请公布号
EP1032748(A4)
申请公布日期
2001.01.31
申请号
EP19980955012
申请日期
1998.10.21
申请人
COOPER, LARRY V.
发明人
COOPER, LARRY V.
分类号
E21B17/20;E21B23/14;E21B31/00;(IPC1-7):E21B31/00;E21B17/02
主分类号
E21B17/20
代理机构
代理人
主权项
地址
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