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发明名称
MEJORAS EN LOS TELEFONOS PROVISTOS DE CAPSULA DE MICROFONO Y AURICULAR CON UN CRISTAL PIEZO-ELECTRICO
摘要
申请公布号
ES229103(A1)
申请公布日期
1956.10.01
申请号
ES19030002291
申请日期
1956.06.09
申请人
BRANDSTAETTER,GEORG
发明人
分类号
(IPC1-7):H04
主分类号
(IPC1-7):H04
代理机构
代理人
主权项
地址
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