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发明名称
DISPOSITIVO DE VIGILANCIA PEDAGOGICA, DE CONTROL DE COPIAS O DEBERES ESCRITOS DESTINADOS A SER CORREGIDOS Y REGISTRO DELOS RESULTADOS.
摘要
申请公布号
ES148869(Y)
申请公布日期
1970.06.16
申请号
ES19690001488U
申请日期
1968.01.23
申请人
EWALD, EDOUARD, CARL SARTORIUS
发明人
分类号
G09B1/00;(IPC1-7):G09B/
主分类号
G09B1/00
代理机构
代理人
主权项
地址
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