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发明名称
Improvements relating to ball valves
摘要
申请公布号
GB9511386(D0)
申请公布日期
1995.08.02
申请号
GB19950011386
申请日期
1995.06.06
申请人
PETROLEUM ENGINEERING SERVICES LIMITED
发明人
分类号
E21B34/00;E21B34/10;F16K5/06
主分类号
E21B34/00
代理机构
代理人
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