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发明名称
Pilot-operated pressure-equalizing mechanism for subsurface valve
摘要
申请公布号
GB9928985(D0)
申请公布日期
2000.02.02
申请号
GB19990028985
申请日期
1999.12.09
申请人
CAMCO INTERNATIONAL INC
发明人
分类号
E21B34/00;E21B34/10
主分类号
E21B34/00
代理机构
代理人
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地址
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