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Advertising display
摘要
申请公布号
US1796153(A)
申请公布日期
1931.03.10
申请号
US19290334848
申请日期
1929.01.24
申请人
THE HOOVER COMPANY
发明人
HOOVER HOWARD EARL
分类号
G09F19/10
主分类号
G09F19/10
代理机构
代理人
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