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FR DES LAMPES A INCANDESCENCE
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FR DES LAMPES A INCANDESCENCE
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Application filed by FR DES LAMPES A INCANDESCENCEfiledCriticalFR DES LAMPES A INCANDESCENCE
Application grantedgrantedCritical
Publication of FR672977ApublicationCriticalpatent/FR672977A/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
H01K9/06—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 device, e.g. switch, for automatically completing circuit of reserve body
FR672977D1929-04-111929-04-11Lampe électrique à incandescence
ExpiredFR672977A
(fr)