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IND DE E C GRAMMONT ETS
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IND DE E C GRAMMONT ETS
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Publication of FR640184ApublicationCriticalpatent/FR640184A/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
H01J1/135—Circuit arrangements therefor, e.g. for temperature control
FR640184D1927-08-111927-08-11Perfectionnement aux lampes du genre triode, en vue de permettre de les alimenter parun courant alternatif
ExpiredFR640184A
(fr)