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Publication of FR628823ApublicationCriticalpatent/FR628823A/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
FR628823D1927-02-081927-02-08
Bayonet base for multi-filament electric lamps
ExpiredFR628823A
(en)