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发明名称
Advertising device
摘要
申请公布号
US2291168(A)
申请公布日期
1942.07.28
申请号
US19410397954
申请日期
1941.06.13
申请人
WALTER EVANS
发明人
MICKELSON GILBERT
分类号
G09F13/34
主分类号
G09F13/34
代理机构
代理人
主权项
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