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Publication of FR652649ApublicationCriticalpatent/FR652649A/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
FR652649D1928-04-131928-04-13Dispositif pour lampes à incandescence
ExpiredFR652649A
(fr)