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发明名称
Ball valve actuated by shifting tool passing through centre of valve
摘要
申请公布号
GB2312909(A)
申请公布日期
1997.11.12
申请号
GB19970009581
申请日期
1997.05.12
申请人
* SCHLUMBERGER LIMITED
发明人
DANISH * PATEL
分类号
E21B34/00;E21B34/10;E21B34/14;(IPC1-7):E21B34/14
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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