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经营范围
发明名称
WELL SAFETY VALVE SYSTEM
摘要
申请公布号
GB2035414(A)
申请公布日期
1980.06.18
申请号
GB19790036565
申请日期
1979.10.22
申请人
OTIS ENG CORP
发明人
分类号
E21B34/00;E21B34/10;(IPC1-7):E21B34/10
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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