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发明名称
Audio-visual electronic instructor
摘要
申请公布号
US3026634(A)
申请公布日期
1962.03.27
申请号
US19590792544
申请日期
1959.02.11
申请人
LINGUATRONICS, INC.
发明人
IRAZOQUI CARLOS A.
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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