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发明名称
Electronic Teaching Device
摘要
申请公布号
GB2090037(A)
申请公布日期
1982.06.30
申请号
GB19810031407
申请日期
1981.10.19
申请人
DENSHIBUROKKUKIKISEIZO KK
发明人
分类号
G09B23/18;(IPC1-7):G09B23/18
主分类号
G09B23/18
代理机构
代理人
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地址
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