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Publication of FR617267ApublicationCriticalpatent/FR617267A/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
H01J1/135—Circuit arrangements therefor, e.g. for temperature control
FR617267D1925-10-211925-10-21
Enhancements to t lamps. s. f.
ExpiredFR617267A
(en)