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UM NOVO DISPOSITIVO DE RESFRIAMENTO ADAPTADO AOS MICROPHONES PARA CORRENTES DE GRANDE INTENSIDADE

0.1 - Acervo Histórico de patentes do INPI-6261
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15/06/1910

Part of Acervo Histórico de patentes do INPI

UM NOVO DISPOSITIVO DE RESFRIAMENTO ADAPTADO AOS MICROFONES PARA CORRENTES DE GRANDE INTENSIDADE

CARL EMIL EGNER; JOHAN GUNNAR HOLMSTROM

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