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发明名称
PERFECCIONAMIENTOS EN LOS SISTEMAS DE ENSENANZA RADIADA DE IDIOMAS, CON SUS MEDIOS DE REALIZACIoN PRáCTICA
摘要
申请公布号
ES186562(A2)
申请公布日期
1949.03.01
申请号
ES19620001865
申请日期
1949.01.10
申请人
MANGOLD, WALTER
发明人
分类号
(IPC1-7):G09
主分类号
(IPC1-7):G09
代理机构
代理人
主权项
地址
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