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Application filedfiledCritical
Priority to NL6511878ApriorityCriticalpatent/NL6511878A/xx
Priority to FR75795Aprioritypatent/FR1496249A/fr
Priority to BE686689Dprioritypatent/BE686689A/fr
Publication of NL6511878ApublicationCriticalpatent/NL6511878A/xx
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
H01J1/14—Solid thermionic cathodes characterised by the material