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Publication of FR546419ApublicationCriticalpatent/FR546419A/en
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
FR546419D1921-11-171922-01-27
Regenerable filament circuit incandescent electric lamp
ExpiredFR546419A
(en)