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发明名称
EQUALISING MEANS FOR A SUBSURFACE WELL SAFETY VALVE
摘要
申请公布号
GB2181765(A)
申请公布日期
1987.04.29
申请号
GB19860023263
申请日期
1986.09.26
申请人
* CAMCO INCORPORATED
发明人
RONALD EARL * PRINGLE
分类号
E21B34/00;E21B34/10;(IPC1-7):E21B34/10
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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