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发明名称
Educational apparatus
摘要
申请公布号
US2184120(A)
申请公布日期
1939.12.19
申请号
US19380221513
申请日期
1938.07.27
申请人
HARRIS RAYMOND E
发明人
HARRIS RAYMOND E.
分类号
G09B7/10
主分类号
G09B7/10
代理机构
代理人
主权项
地址
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