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CLAUDE NEQN LIGHTS Inc
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CLAUDE NEQN LIGHTS Inc
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Application filed by CLAUDE NEQN LIGHTS IncfiledCriticalCLAUDE NEQN LIGHTS Inc
Application grantedgrantedCritical
Publication of FR697461ApublicationCriticalpatent/FR697461A/fr
H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
H01J61/16—Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent
FR697461D1929-06-261930-06-16Perfectionnements aux tubes luminescents à décharge dans une atmosphère de gaz
ExpiredFR697461A
(fr)