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H01J17/00—Gas-filled discharge tubes with solid cathode
H01J17/02—Details
H01J17/04—Electrodes; Screens
FR26292D1922-04-251922-04-25Utilisation de l'arc électrique pour le redressement de courants et pour l'entretien d'oscillations électriques
ExpiredFR26292E
(fr)