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R Leutwyler Y Cia
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R Leutwyler Y Cia
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Priority to ES83665ApriorityCriticalpatent/ES83665A1/es
Publication of ES83665A1publicationCriticalpatent/ES83665A1/es
ES83665A1922-12-011922-12-01Procedimiento y aparato para la formación de filamentos metálicos de lámparas eléctricas de incandescencia.
ExpiredES83665A1
(es)