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Publication of FR625519ApublicationCriticalpatent/FR625519A/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
FR625519D1925-12-011926-12-01Perfectionnements relatifs aux dispositifs thermioniques
ExpiredFR625519A
(fr)