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发明名称
Projecting and viewing device for cards with microfilm and the like
摘要
申请公布号
US2495528(A)
申请公布日期
1950.01.24
申请号
US19470735285
申请日期
1947.03.18
申请人
FILM 'N FILE, INC.
发明人
LANGAN JOHN F.
分类号
G03B21/11
主分类号
G03B21/11
代理机构
代理人
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地址
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