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发明名称
Educational and display device
摘要
申请公布号
US2310738(A)
申请公布日期
1943.02.09
申请号
US19410387489
申请日期
1941.04.08
申请人
JOHNSTON CHARLES O
发明人
JOHNSTON CHARLES O.
分类号
G09B25/02;G09F27/00
主分类号
G09B25/02
代理机构
代理人
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地址
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