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LOW-PRESSURE MERCURY VAPOUR DISCHARGE SOURCE OF LIGHT IN FIRST OF ALL ELECTRIC DISCHARGE LAMP WITH A LUMINESCENT LAYER HAVING INACTIVE INGREDIENT AND A LUMINESCENT COMPOSITION FOR MERCURY VAPOUR DISCHARGE SOURCE OF LIGHT
LOW-PRESSURE MERCURY VAPOUR DISCHARGE SOURCE OF LIGHT IN FIRST OF ALL ELECTRIC DISCHARGE LAMP WITH A LUMINESCENT LAYER HAVING INACTIVE INGREDIENT AND A LUMINESCENT COMPOSITION FOR MERCURY VAPOUR DISCHARGE SOURCE OF LIGHT