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发明名称
Educational apparatus
摘要
申请公布号
US1826180(A)
申请公布日期
1931.10.06
申请号
US19290362345
申请日期
1929.05.11
申请人
KLOPSTEG PAUL E
发明人
KLOPSTEG PAUL E.
分类号
G09B23/10
主分类号
G09B23/10
代理机构
代理人
主权项
地址
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