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发明名称
BAR VENT FOR DOWNHOLE TOOL
摘要
申请公布号
EP0233750(A3)
申请公布日期
1989.01.18
申请号
EP19870301145
申请日期
1987.02.10
申请人
HALLIBURTON COMPANY
发明人
WESSON, DAVID S.;WALL, STANLEY JAY;HALES, JOHN H.
分类号
E21B34/10;E21B34/14;E21B43/116;E21B43/119;(IPC1-7):E21B34/10
主分类号
E21B34/10
代理机构
代理人
主权项
地址
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