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发明名称
Educational apparatus
摘要
申请公布号
US1860895(A)
申请公布日期
1932.05.31
申请号
US19280274385
申请日期
1928.05.02
申请人
LOUIS MARX
发明人
MARX LOUIS
分类号
G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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