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发明名称
Placard
摘要
申请公布号
US1938919(A)
申请公布日期
1933.12.12
申请号
US19310531482
申请日期
1931.04.20
申请人
MARSH HARRY V
发明人
MARSH HARRY V.
分类号
G09F5/00
主分类号
G09F5/00
代理机构
代理人
主权项
地址
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