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Verfahren zum Bedecken eines Glühdrahtes für eine indirekt geheizte Kathode mit einer dunkelgefärbten Isolierschicht, nach diesem Verfahren hergestellter Glühdraht und Verwendung eines solchen Glühdrahtes für die Kathode einer elektrischen Entladungsröhre
Un procedimiento para la obtención de cuerpos de distintas clases de filamentos, alambres o análogos de materia artificial, o con envuelta de materia artificial, especialmente de cuerpos huecos, por ejemplo, de bigudís para enrollar rizos.