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发明名称
TEACHING APPARATUS
摘要
申请公布号
SU809319(A1)
申请公布日期
1981.02.28
申请号
SU19792764905
申请日期
1979.05.31
申请人
LVOV VLADIMIR M,SU;SMIRNOV YURIJ ,SU
发明人
LVOV VLADIMIR M,SU;SMIRNOV YURIJ ,SU
分类号
G09B7/02;(IPC1-7):G09B7/02
主分类号
G09B7/02
代理机构
代理人
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