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发明名称
ARITHMETIC TEACHING AID
摘要
申请公布号
SU978182(A1)
申请公布日期
1982.11.30
申请号
SU19802864871
申请日期
1980.01.04
申请人
DO POLT INSTITUT
发明人
ZINOVEV LEONID M,SU
分类号
G09B23/02;(IPC1-7):G09B23/02
主分类号
G09B23/02
代理机构
代理人
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地址
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