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发明名称
TEACHING APPARATUS
摘要
申请公布号
GB1467675(A)
申请公布日期
1977.03.16
申请号
GB19740020287
申请日期
1974.05.08
申请人
SONY CORP
发明人
分类号
G09B5/04;G09B5/08;G11B5/00;(IPC1-7):G09B5/04;G11B31/00
主分类号
G09B5/04
代理机构
代理人
主权项
地址
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