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发明名称
Improvements relating to card indexes
摘要
申请公布号
GB659198(A)
申请公布日期
1951.10.17
申请号
GB19490004994
申请日期
1949.02.23
申请人
RUEGG-NAEGELI & CIE
发明人
分类号
B42F17/32
主分类号
B42F17/32
代理机构
代理人
主权项
地址
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