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Publication of FR718752ApublicationCriticalpatent/FR718752A/fr
H01K9/00—Lamps having two or more incandescent bodies separately heated
H01K9/02—Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies
H01K9/04—Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies with built-in manually operated switch
FR718752D1931-06-171931-06-17Ampoule électrique polytensions à culot permutateur
ExpiredFR718752A
(fr)