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发明名称
Annulus valve for concentric tubing hangers
摘要
申请公布号
US4869318(A)
申请公布日期
1989.09.26
申请号
US19880242530
申请日期
1988.09.12
申请人
CAMERON IRON WORKS USA, INC.
发明人
KELLETT, RODNEY
分类号
E21B33/04;E21B34/02
主分类号
E21B33/04
代理机构
代理人
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