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发明名称
(U1 Y2) ;MATERIAL DIDACTICO PARA LA NUMERACION, SUMA Y RESTA DE NUMEROS NATURALES INFERIORES A MIL
摘要
申请公布号
ES1005760(U1)
申请公布日期
1988.12.01
申请号
ES19870000983
申请日期
1987.03.25
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
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