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Carta de Hugo Gernsback a Marcello Damy de Souza Santos

Carta de Hugo Gernsback a Marcello Damy de Souza Santos

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Carta recebida por Marcello Damy de Souza Santos, enviada por Hugo Gernsback, editor da Radio Craft, solicitando cópia das pesquisas do professor Ehrenhaft em Pure Magnetic Currents, os artigos são da edição de março de 1944 da revista Radio Craft.