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发明名称
Retainer valve
摘要
申请公布号
GB2340156(A)
申请公布日期
2000.02.16
申请号
GB19990016878
申请日期
1999.07.19
申请人
* SCHLUMBERGER HOLDINGS LIMITED
发明人
VANCE * NIXON;GARY L * RYTLEWSKI;ANTHONY P * VOVERS
分类号
E21B34/04;(IPC1-7):E21B34/04
主分类号
E21B34/04
代理机构
代理人
主权项
地址
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