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发明名称
Educational aid
摘要
申请公布号
GB2270789(B)
申请公布日期
1996.02.07
申请号
GB19930010287
申请日期
1993.05.19
申请人
ANTHONY DONALD * BIRKBY
发明人
ANTHONY DONALD * BIRKBY
分类号
G06C1/00;G09B19/02;(IPC1-7):G09B19/02
主分类号
G06C1/00
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代理人
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