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发明名称
Downhole shuttle valve for wells
摘要
申请公布号
US4846272(A)
申请公布日期
1989.07.11
申请号
US19880233422
申请日期
1988.08.18
申请人
EASTERN OIL TOLLS PTE, LTD.
发明人
LEGGETT, HENRY H.
分类号
E21B34/06;E21B34/10;E21B34/14
主分类号
E21B34/06
代理机构
代理人
主权项
地址
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