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FR DE LAMPES A INCANDESCENCE L
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FR DE LAMPES A INCANDESCENCE L
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Publication of FR31437EpublicationCriticalpatent/FR31437E/fr
H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
H01J1/02—Main electrodes
H01J1/13—Solid thermionic cathodes
H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
FR31437D1925-07-071925-07-07Lampe de t. s. f.
ExpiredFR31437E
(fr)