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发明名称
Dispositivo amplificador de señales acústicas
摘要
申请公布号
ES21454(U)
申请公布日期
1950.01.01
申请号
ES19540000214U
申请日期
1949.11.24
申请人
DE LA SERNA GIL, PEDRO
发明人
分类号
主分类号
代理机构
代理人
主权项
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