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METHOD FOR MAKING MERCURY-VAPOUR DISCHARGE LAMPS, MERCURY-VAPOUR DISCHARGE LAMP MADE THEREBY, METAL PLATE HOLDER FILLED WITH MERCURY FOR CARRING OUT THEREOF, AND LAMP-ENVELOPE CONTAINING CLOSED METAL HOLDER WITH DRAIN PIPE
METHOD FOR MAKING MERCURY-VAPOUR DISCHARGE LAMPS, MERCURY-VAPOUR DISCHARGE LAMP MADE THEREBY, METAL PLATE HOLDER FILLED WITH MERCURY FOR CARRING OUT THEREOF, AND LAMP-ENVELOPE CONTAINING CLOSED METAL HOLDER WITH DRAIN PIPE