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发明名称
Alphabetic index system with registry elements having checking marks obtained by punching
摘要
申请公布号
US2558546(A)
申请公布日期
1951.06.26
申请号
US19480016358
申请日期
1948.03.22
申请人
DEN OUTER MARIUS
发明人
OUTER MARIUS DEN
分类号
B42F17/00
主分类号
B42F17/00
代理机构
代理人
主权项
地址
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