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UM PROCESSO DE COMUNICAÇÕES TELEPHONICAS PARA LUGARES DE MUITO RUIDO, UM SYSTEMA TELEPHONICO E UM TRANSMISSOR TELEPHONICO PARA ESSE FIM

0.1 - Acervo Histórico de patentes do INPI-16113
Item
25/09/1919

Part of Acervo Histórico de patentes do INPI

UM PROCESSO DE COMUNICAÇÕES TELEFÔNICAS PARA LUGARES DE MUITO RUÍDO, UM SISTEMA TELEFÔNICO E UM TRANSMISSOR TELEFÔNICO PARA ESSE FIM

THE MAGNAVOX COMPANY

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