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发明名称
Visible index and visible record system
摘要
申请公布号
US1867710(A)
申请公布日期
1932.07.19
申请号
US19300444902
申请日期
1930.04.17
申请人
ACME CARD SYSTEM COMPANY
发明人
POWELL FRANK D.
分类号
B42F17/18
主分类号
B42F17/18
代理机构
代理人
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