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发明名称
Device for teaching time
摘要
申请公布号
US3131489(A)
申请公布日期
1964.05.05
申请号
US19630275091
申请日期
1963.04.23
申请人
GERALD ALPERT
发明人
ALPERT GERALD
分类号
G09B19/12
主分类号
G09B19/12
代理机构
代理人
主权项
地址
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