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发明名称
Improvements in card index systems
摘要
申请公布号
GB350309(A)
申请公布日期
1931.06.11
申请号
GB19300022518
申请日期
1930.07.25
申请人
OTTO EDLER;FRITZ EDLER
发明人
分类号
B42F17/00
主分类号
B42F17/00
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代理人
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