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发明名称
Improvements in or relating to loose-leaf record cards or sheets
摘要
申请公布号
GB643124(A)
申请公布日期
1950.09.15
申请号
GB19480016055
申请日期
1948.06.15
申请人
FRANK MAYO MABBETT;ALFRED PLUMMER
发明人
分类号
B42F3/00
主分类号
B42F3/00
代理机构
代理人
主权项
地址
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