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BR20384968A1967-11-111968-11-08Tubo de raios catodicos compreendendo pelo menos um canhao eletronico para produzir um minimo de feixes de eletrons
BR6803849D0
(pt)
Aperfeicoamentos em ou relativos a arranjos de circuito para corrigir a distorcao almofada de alfinetes mediante desvio de um feixe de eletrons em um tubo de exibicao