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TECH IND LAB DE
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TECH IND LAB DE
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Publication of FR763579ApublicationCriticalpatent/FR763579A/fr
H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
H01J61/14—Selection of substances for gas fillings; Specified operating pressure or temperature having one or more carbon compounds as the principal constituents
FR763579D1933-01-071933-01-07Tubes luminescents pour l'éclairage électrique
ExpiredFR763579A
(fr)