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发明名称
ANNULAR BLOWOUT PREVENTER WITH UPPER AND LOWER SPHERICAL SEALING SURFACES
摘要
申请公布号
GB2077326(A)
申请公布日期
1981.12.16
申请号
GB19810016452
申请日期
1981.05.29
申请人
NL INDUSTRIES INC
发明人
分类号
E21B33/06;E21B33/064;(IPC1-7):E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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