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发明名称
EQUALIZING MEANS FOR A SUBSURFACE WELL SAFETY VALVE
摘要
申请公布号
GB2195377(B)
申请公布日期
1990.03.28
申请号
GB19870009402
申请日期
1987.04.21
申请人
* CAMCO INCORPORATED
发明人
ARTHUR JOHN * MORRIS
分类号
E21B34/00;E21B34/10
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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