Swan returned to consider the problem of the light bulb with the aid of a better vacuum and a carbonised thread as a filament
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Swan returned to consider the problem of the light bulb with the aid of a better vacuum and a carbonised thread as a filament
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-18 from Wikipedia. The archived copy is preserved so this citation survives link rot.