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Publication of BE525726ApublicationCriticalpatent/BE525726A/xx
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
H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal