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经营范围
发明名称
Device for keeping index cards
摘要
申请公布号
GB850057(A)
申请公布日期
1960.09.28
申请号
GB19570030740
申请日期
1957.10.01
申请人
SVEN-OTTO DUBOIS
发明人
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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