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发明名称
Means for successively exhibiting groups of signs
摘要
申请公布号
US1839545(A)
申请公布日期
1932.01.05
申请号
US19270188708
申请日期
1927.05.04
申请人
FRANK FRYE
发明人
FRYE FRANK
分类号
B61D41/00
主分类号
B61D41/00
代理机构
代理人
主权项
地址
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