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发明名称
Improvements in or relating to appliances for the upright filing of index cards
摘要
申请公布号
GB578172(A)
申请公布日期
1946.06.18
申请号
GB19440011059
申请日期
1944.06.09
申请人
BELA LAMPEL
发明人
分类号
B42F21/00
主分类号
B42F21/00
代理机构
代理人
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