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发明名称
Visible card reference system and means for mounting same
摘要
申请公布号
US2253630(A)
申请公布日期
1941.08.26
申请号
US19400324992
申请日期
1940.03.20
申请人
NATIONAL PAD & TABLET CORP.
发明人
LAPPER BENJAMIN
分类号
B42F17/00
主分类号
B42F17/00
代理机构
代理人
主权项
地址
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