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Application filed by Julius Bilfinger, Wilhelm Boehm, Kaufholz K EfiledCriticalJulius Bilfinger
Publication of CH10230ApublicationCriticalpatent/CH10230A/de
Un procedimiento de proteger, recubriendo el filamento de las lámparas incandescentes de corriente eléctrica, de un cuerpo aislador transparente e incombustible.