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Processo para producao de particulas de ferrita,isentas de espacos vazios,substancialmente esfericas,particulas produzidas pelo mesmo e processo eletrotatografico de formacao de imagens que utiliza mistura de revelador contendo as particulas de ferrita
Procede de preparation de particules en polystyrene expansible appropriees pour la production de corps moules ayant une structure alveolaire et des caracteristiques de bonne qualite