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APERFEIÇOAMENTOS EM SYSTEMAS MODULADORES E TRANSMISSORES DE SIGNAES TELEGRAPHICOS E TELEPHONICOS

0.1 - Acervo Histórico de patentes do INPI-16894
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12/05/1920

Part of Acervo Histórico de patentes do INPI

APERFEIÇOAMENTOS EM SISTEMAS MODULADORES E TRANSMISSORES DE SINAIS TELEGRÁFICOS E TELEFÔNICOS

INTERNATIONAL WESTERN ELECTRIC COMPANY, INCORPORATED

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