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发明名称
Educational aid
摘要
申请公布号
GB2243938(B)
申请公布日期
1993.12.08
申请号
GB19900010605
申请日期
1990.05.11
申请人
* INVICTA PLASTICS LIMITED
发明人
NICOLA JANE * COBB;DAVID JOHN * CRAIGIE
分类号
G09B19/12;(IPC1-7):G09B19/12
主分类号
G09B19/12
代理机构
代理人
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地址
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