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发明名称
Downhole valve
摘要
申请公布号
GB9721496(D0)
申请公布日期
1997.12.10
申请号
GB19970021496
申请日期
1997.10.09
申请人
OCRE (SCOTLAND) LIMITED
发明人
分类号
E21B34/06;E21B34/10
主分类号
E21B34/06
代理机构
代理人
主权项
地址
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