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发明名称
FAIL-SAFE VALVE
摘要
申请公布号
GB8921104(D0)
申请公布日期
1989.11.01
申请号
GB19890021104
申请日期
1989.09.18
申请人
BRITISH PETROLEUM COMPANY PLC, THE
发明人
分类号
E21B34/04;F16K31/122
主分类号
E21B34/04
代理机构
代理人
主权项
地址
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