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发明名称
MATERIAL DIDACTICO PARA EL APRENDIZAJE DE UNIDADES DECIMA- LES,DE LONGITUD,DE PESO Y DE CAPACIDAD
摘要
申请公布号
ES252100(Y)
申请公布日期
1981.04.16
申请号
ES20000002521U
申请日期
1980.07.16
申请人
发明人
分类号
G09B23/02;(IPC1-7):09B23/02
主分类号
G09B23/02
代理机构
代理人
主权项
地址
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