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发明名称
PERFECCIONAMIENTOS EN LAS INSTALACIONES DE INTERCOMUNICACIËN A VIVA VOZ
摘要
申请公布号
ES234807(A3)
申请公布日期
1957.06.16
申请号
ES19070002348
申请日期
1957.04.11
申请人
DUCATI ELECTROTECNICA, SOCIETR PER AZIONI
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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