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发明名称
Improvements relating to roof ventilators
摘要
申请公布号
GB632898(A)
申请公布日期
1949.12.05
申请号
GB19470031803
申请日期
1947.12.02
申请人
EDWARD WALLACE
发明人
分类号
F24F7/02
主分类号
F24F7/02
代理机构
代理人
主权项
地址
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