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发明名称
Improvements in advertising signs
摘要
申请公布号
GB341037(A)
申请公布日期
1931.01.05
申请号
GB19290030184
申请日期
1929.10.04
申请人
???
发明人
分类号
G09F7/12
主分类号
G09F7/12
代理机构
代理人
主权项
地址
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