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发明名称
Educational device for teaching children to tell time
摘要
申请公布号
US2997794(A)
申请公布日期
1961.08.29
申请号
US19590859497
申请日期
1959.12.14
申请人
BURR ESTHER M
发明人
BURR ESTHER M.
分类号
G09B19/12
主分类号
G09B19/12
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代理人
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