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Publication of FR670821ApublicationCriticalpatent/FR670821A/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
FR670821D1929-03-021929-03-02Lampe électrique à filaments multiples
ExpiredFR670821A
(fr)