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发明名称
Improvements in or relating to ventilation units for walls
摘要
申请公布号
GB630298(A)
申请公布日期
1949.10.10
申请号
GB19470014314
申请日期
1947.05.29
申请人
RONALD GEORGE SNELL
发明人
分类号
F24F7/00
主分类号
F24F7/00
代理机构
代理人
主权项
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