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发明名称
ANNULUS SHUT-OFF MECHANISM
摘要
申请公布号
GB2214543(B)
申请公布日期
1991.11.13
申请号
GB19890000895
申请日期
1989.01.16
申请人
THE * BRITISH PETROLEUM COMPANY P.L.C
发明人
CHRISTOPHER ELLISON * DYKES;PETER WYNDHAM * FRANCIS;HANS PAUL * HOPPER
分类号
E21B33/047
主分类号
E21B33/047
代理机构
代理人
主权项
地址
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