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发明名称
Device for displaying interchangeable advertisements
摘要
申请公布号
US1830031(A)
申请公布日期
1931.11.03
申请号
US19290362999
申请日期
1929.05.14
申请人
KLEIN GERHARD A
发明人
KLEIN GERHARD A.
分类号
G09F7/00
主分类号
G09F7/00
代理机构
代理人
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地址
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