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发明名称
Flap valve
摘要
申请公布号
GB201022020(D0)
申请公布日期
2011.02.02
申请号
GB20100022020
申请日期
2010.12.23
申请人
D C NORRIS & COMPANY LTD
发明人
分类号
主分类号
代理机构
代理人
主权项
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