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经营范围
发明名称
EDUCATIONAL DEVICE
摘要
申请公布号
DE3169692(D1)
申请公布日期
1985.05.09
申请号
DE19813169692
申请日期
1981.09.08
申请人
EXELBY, NICHOLAS
发明人
EXELBY, NICHOLAS
分类号
C09B17/00;G09B17/00;(IPC1-7):G09B17/00
主分类号
C09B17/00
代理机构
代理人
主权项
地址
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