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发明名称
Educational device
摘要
申请公布号
US2973588(A)
申请公布日期
1961.03.07
申请号
US19600014737
申请日期
1960.03.14
申请人
MONZINGO REGINALD V
发明人
MONZINGO REGINALD V.
分类号
G09B5/06
主分类号
G09B5/06
代理机构
代理人
主权项
地址
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