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发明名称
Educational device
摘要
申请公布号
US1840507(A)
申请公布日期
1932.01.12
申请号
US19260119549
申请日期
1926.06.30
申请人
HANKS EMILY G
发明人
HANKS EMILY G.
分类号
G09B19/10
主分类号
G09B19/10
代理机构
代理人
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