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filament-lamp ILLUMIN

filament-lamp

filament lamp ILLUMIN

two-filament lamp AUTO

vacuum filament lamp ILLUMIN

Esempi monolingue (non verificati dalla Redazione di PONS)

inglese
Development of the tungsten-filament lamp in 1904, with three times the efficacy of carbon filament types, and improved batteries, made flashlights more useful and popular.
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