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发明名称
DOUBLE ANNULUS SHUT-OFF MECHANISM
摘要
申请公布号
GB9107872(D0)
申请公布日期
1991.05.29
申请号
GB19910007872
申请日期
1991.04.12
申请人
BP EXPLORATION OPERATING COMPANY LIMITED
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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