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发明名称
DUAL HYDRAULIC SAFETY VALVE
摘要
申请公布号
GB2222622(A)
申请公布日期
1990.03.14
申请号
GB19890010718
申请日期
1989.05.10
申请人
* CAMCO INCORPORATED
发明人
DWAYNE D. * LEISMER;WILLIAM ALLEN * BLIZZARD
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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