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发明名称
Educational device
摘要
申请公布号
US2189902(A)
申请公布日期
1940.02.13
申请号
US19370160900
申请日期
1937.08.25
申请人
HISER ERNEST F
发明人
HISER ERNEST F.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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