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发明名称
Un sistema de emisión y recepción telefónica amplificada electrónicamente
摘要
申请公布号
ES31914(U)
申请公布日期
1952.08.01
申请号
ES19140000319U
申请日期
1952.07.11
申请人
NAVARRO ALONSO, RAFAEL;ARNIO CALVET, EMILIO
发明人
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主分类号
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