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发明名称
METHOD AND APPARATUS FOR DISPLAYING NUMERIC CHARACTER OF MULTIPLICATION TEACHING AID
摘要
申请公布号
KR1019930009997(B1)
申请公布日期
1993.10.13
申请号
KR1019910002295
申请日期
1991.02.11
申请人
发明人
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主分类号
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