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发明名称
Collapsible advertisement stand with letter balance
摘要
申请公布号
US2186913(A)
申请公布日期
1940.01.09
申请号
US19370176615
申请日期
1937.11.26
申请人
KARL GUTMANN
发明人
JONAS WILLI
分类号
G09F23/00
主分类号
G09F23/00
代理机构
代理人
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