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H01K1/52—Means for obtaining or maintaining the desired pressure within the vessel
H01K1/54—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering
FR549654D1922-04-031922-04-03Perfectionnements apportés à la fabrication des lampes électriques à incandescence à filament métallique
ExpiredFR549654A
(fr)