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Daito Denki KK
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Daito Denki KK
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Publication of FR573720ApublicationCriticalpatent/FR573720A/fr
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
H01K1/56—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering characterised by the material of the getter
FR573720D1923-11-221923-11-22Perfectionnements aux lampes électriques à incandescence
ExpiredFR573720A
(fr)