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APERFEIÇOAMENTOS EM COMMUTADORES APPLICAVEIS A SYSTEMAS TELEPHONICOS AUTOMATICOS E SEMI-AUTOMATICOS

0.1 - Acervo Histórico de patentes do INPI-12120
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06/05/1914

Part of Acervo Histórico de patentes do INPI

APERFEIÇOAMENTOS EM COMUTADORES APLICÁVEIS A SISTEMAS TELEFÔNICOS AUTOMÁTICOS E SEMI-AUTOMÁTICOS

ELECTRICAL PROPERTIES LIMITED

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