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发明名称
SURFACE CONTROL WELL SAFETY VALVE
摘要
申请公布号
GB2012836(B)
申请公布日期
1982.01.13
申请号
GB19780033282
申请日期
1978.08.14
申请人
CAMCO INC
发明人
分类号
E21B34/00;E21B34/10;(IPC1-7):E21B43/12
主分类号
E21B34/00
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代理人
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