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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
H01J1/30—Cold cathodes, e.g. field-emissive cathode
FR608173D1925-03-281925-03-28Tube à vide à corps radio-actifs
ExpiredFR608173A
(fr)