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发明名称
Improvements in or relating to advertising and display devices
摘要
申请公布号
GB316865(A)
申请公布日期
1930.10.02
申请号
GB19290020301
申请日期
1929.07.02
申请人
ERNST AGAHD
发明人
分类号
G09F13/06
主分类号
G09F13/06
代理机构
代理人
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