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H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
H01J9/38—Exhausting, degassing, filling, or cleaning vessels
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FR648862D1926-10-261927-10-24Procédé pour l'obtention d'un vide très intense
ExpiredFR648862A
(fr)