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发明名称
Educational device
摘要
申请公布号
US2933827(A)
申请公布日期
1960.04.26
申请号
US19560600338
申请日期
1956.07.26
申请人
DARWIN ALBERTS CECIL
发明人
ALBERTS CECIL DARWIN
分类号
G09B1/06
主分类号
G09B1/06
代理机构
代理人
主权项
地址
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