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发明名称
ORIFICE WELL SAFETY VALVE WITH RELEASE MECHANISM
摘要
申请公布号
GB2245914(A)
申请公布日期
1992.01.15
申请号
GB19910014325
申请日期
1991.07.03
申请人
* CAMCO INTERNATIONAL INC
发明人
WILLIAM ALLEN * BLIZZARD JR
分类号
E21B34/08
主分类号
E21B34/08
代理机构
代理人
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