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发明名称
Downhole surge valve for earth boring apparatus
摘要
申请公布号
US4928775(A)
申请公布日期
1990.05.29
申请号
US19880292243
申请日期
1988.12.30
申请人
GAS RESEARCH INSTITUTE
发明人
LEE, DOUGLAS W.
分类号
E21B4/14;E21B34/12
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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