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经营范围
发明名称
TEACHING AIDS
摘要
申请公布号
GB1476133(A)
申请公布日期
1977.06.10
申请号
GB19740009545
申请日期
1975.02.24
申请人
ATKINSON E
发明人
分类号
G09B5/02;G09B5/04;G09B17/04;(IPC1-7):G09B5/02;G09B15/00
主分类号
G09B5/02
代理机构
代理人
主权项
地址
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