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发明名称
Improvements in card index systems
摘要
申请公布号
GB530606(A)
申请公布日期
1940.12.16
申请号
GB19390018853
申请日期
1939.06.28
申请人
MARTIN AUGUST HANSEN AAMODT
发明人
分类号
B42F17/00
主分类号
B42F17/00
代理机构
代理人
主权项
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