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发明名称
Downhole valve apparatus
摘要
申请公布号
GB2309723(A)
申请公布日期
1997.08.06
申请号
GB19970002298
申请日期
1997.02.03
申请人
* OCRE
发明人
CLIVE JOHN * FRENCH;GLEN * BATTEN
分类号
E21B23/04;E21B23/06;E21B33/127;E21B34/00;E21B34/10;(IPC1-7):E21B34/06
主分类号
E21B23/04
代理机构
代理人
主权项
地址
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