Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01J
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
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61/00
Gas-discharge or vapour-discharge lamps
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H01J61/70
Lamps with low-pressure unconstricted discharge; having a cold pressure < 400 Torr
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H01J61/74
having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium
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