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发明名称
Educational device
摘要
申请公布号
US1860483(A)
申请公布日期
1932.05.31
申请号
US19290398997
申请日期
1929.10.11
申请人
SEWALL FRANK J
发明人
SEWALL FRANK J.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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