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Isem BV
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Isem BV
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Publication of FR645419ApublicationCriticalpatent/FR645419A/fr
H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
FR645419D1926-12-101927-12-08Tube à décharges électriques
ExpiredFR645419A
(fr)