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SILICA SYNDICATE
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SILICA SYNDICATE
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Publication of FR550854ApublicationCriticalpatent/FR550854A/fr
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
H01J9/395—Filling vessels
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FR550854D1921-11-291922-05-01Perfectionnements aux lampes électriques à vapeurs de mercure, ou autres
ExpiredFR550854A
(fr)