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发明名称
Inside out film take-up
摘要
申请公布号
US2788970(A)
申请公布日期
1957.04.16
申请号
US19550485560
申请日期
1955.02.01
申请人
SOCIETY FOR VISUAL EDUCATION, INC.
发明人
KLEERUP BERTEL J.
分类号
G03B21/32
主分类号
G03B21/32
代理机构
代理人
主权项
地址
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