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ES63236A1916-10-271916-10-27Un sistema para obtener la fijación de los culotes de la rosca de las lámparas eléctricas con el porta-lámparas.
ExpiredES63236A1
(es)
Un procedimiento, con sus correspondientes dispositivos, para que con una misma bombilla de luz eléctrica, conseguir intensidades distintas según convenga.