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APERFEIÇOAMENTOS EM TUBOS DE VACUO DO GENERO AUDION

0.1 - Acervo Histórico de patentes do INPI-21112
Item
30/06/1923

Part of Acervo Histórico de patentes do INPI

APERFEIÇOAMENTOS EM TUBOS DE VÁCUO DO GÊNERO AUDION

FRANÇOIS PÉRI

UM TUBO DE VACUO DE TRES ELECTRODOS UTILISADO NA TELEGRAPHIA E NA TELEPHONIA SEM FIO

0.1 - Acervo Histórico de patentes do INPI-21142
Item
11/07/1923

Part of Acervo Histórico de patentes do INPI

UM TUBO DE VÁCUO DE TRÊS ELETRODOS UTILIZADO NA TELEGRAFIA E NA TELEFONIA SEM FIO

FRANÇOIS PÉRI

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