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H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
FR445728A1911-07-071912-07-03Procédé et dispositif pour augmenter la durée, l'uniformité et l'économie des tubes de décharge à cathode incandescente
ExpiredFR445728A
(fr)