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经营范围
发明名称
TEACHING AID
摘要
申请公布号
GB8312577(D0)
申请公布日期
1983.06.08
申请号
GB19830012577
申请日期
1983.05.06
申请人
O'MALLEY, A R
发明人
分类号
G09B;G09B19/02;(IPC1-7):G09B19/02
主分类号
G09B
代理机构
代理人
主权项
地址
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