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发明名称
Educational device
摘要
申请公布号
US1812110(A)
申请公布日期
1931.06.30
申请号
US19300474899
申请日期
1930.08.13
申请人
JACOB MEYERHOFF
发明人
MEYERHOFF JACOB
分类号
G09B27/08
主分类号
G09B27/08
代理机构
代理人
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