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发明名称
Amusing didactic aid
摘要
申请公布号
CZ8949(U1)
申请公布日期
1999.10.13
申请号
CZ19990009465U
申请日期
1999.05.31
申请人
DRUSKA VOJTECH
发明人
DRUSKA VOJTECH
分类号
G09B1/00;G09B1/32;(IPC1-7):G09B001/00;G09B001/32
主分类号
G09B1/00
代理机构
代理人
主权项
地址
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