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Publication of FR345813ApublicationCriticalpatent/FR345813A/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
FR345813D1904-08-241904-08-24Lampe électrique à incandescence
ExpiredFR345813A
(fr)