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发明名称
WELL TOOL WITH IMPROVED VALVE SUPPORT STRUCTURE
摘要
申请公布号
EP0174857(A3)
申请公布日期
1988.06.22
申请号
EP19850306490
申请日期
1985.09.12
申请人
HALLIBURTON COMPANY
发明人
BARRINGTON, BURCHUS Q.
分类号
E21B34/00;E21B34/06;E21B34/12;E21B49/08;(IPC1-7):E21B34/06;F16K5/20
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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