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Perfeccionamientos introducidos en la fabricación de bombillas, que se caracterizan porque lleva montados en serie, paralelo o mixto, dos, cuatro o más filamentos que equivalen a una lámpara independiente y cuyos terminales tiene salida por separado a través del casquillo, para efectuar las conexiones necesarias mediante el culote y portalámparas, verificándose el encendido de todos y cada uno de ellos en intervalos distintos uno del otro.
ES0247291A1959-02-161959-02-16Perfeccionamientos introducidos en la fabricaciën de bombillas
ExpiredES247291A1
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