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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
FR912043D1945-07-091945-07-09Nouvelles électrodes pour tubes à décharges électriques
ExpiredFR912043A
(fr)