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UM SYSTEMA PARA FORNECER SERVIÇO ESPECIAL EM ESTAÇÕES CENTRAES TELEPHONICAS DE COMMUTAÇÃO AUTOMATICA

0.1 - Acervo Histórico de patentes do INPI-14578
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25/10/1917

Part of Acervo Histórico de patentes do INPI

UM SISTEMA PARA FORNECER SERVIÇO ESPECIAL EM ESTAÇÕES CENTRAIS TELEFÔNICAS DE COMUTAÇÃO AUTOMÁTICA

WESTERN ELECTRIC COMPANY, LIMITED

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