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R Leutwyler Y Cia
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R Leutwyler Y Cia
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ES83666A1922-12-011922-12-01Procedimiento y aparato para reponer el filamento en la regeneración de lámparas eléctricas de incandescencia.
ExpiredES83666A1
(es)
Mejoras en los procedimientos y métodos para preparar el tungsteno en general y en particular el que se ha de usar como filamentos en las lámparas eléctricas de incandescencia.