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H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
H01J7/42—Means structurally associated with the tube or lamp for indicating defects or previous use
FR748695D1931-07-201932-07-19Dispositif pour l'indication ou la surveillance (ou les deux) du vide dans les appareils à décharge dans le vide
ExpiredFR748695A
(fr)
Dispositif pour l'indication et la surveillance d'irrégularités dans des transformateurs et appareils électriques analogues remplis d'huile