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经营范围
发明名称
Valve assembly
摘要
申请公布号
GB2339226(B)
申请公布日期
2000.07.19
申请号
GB19990022252
申请日期
1998.03.19
申请人
* SCHLUMBERGER LIMITED
发明人
R PATEL * DINESH
分类号
E21B23/00;E21B34/00;E21B34/10;E21B34/14;(IPC1-7):E21B34/10
主分类号
E21B23/00
代理机构
代理人
主权项
地址
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