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发明名称
DEVICE FOR SHAPING STUDY TASKS
摘要
申请公布号
SU1532961(A1)
申请公布日期
1989.12.30
申请号
SU19874348648
申请日期
1987.12.23
申请人
VITEBSKIJ T I LEGKOJ PROMYSHLENNOSTI
发明人
SHUSHKEVICH VIKTOR L,SU
分类号
G09B3/00
主分类号
G09B3/00
代理机构
代理人
主权项
地址
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