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发明名称
Annulus valve
摘要
申请公布号
US3360048(A)
申请公布日期
1967.12.26
申请号
US19640378675
申请日期
1964.06.29
申请人
REGAN FORGE & ENGINEERING CO.
发明人
WATKINS BRUCE J.
分类号
E21B33/043
主分类号
E21B33/043
代理机构
代理人
主权项
地址
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