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Publication of FR56260EpublicationCriticalpatent/FR56260E/en
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
H01J1/15—Cathodes heated directly by an electric current
FR56260D1944-02-281944-02-28
Improvement to the incandescent cathode of discharge devices
ExpiredFR56260E
(en)