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A lightbulb moment for the old-fashioned filament | Homes | The Guardian
Electrical filament - Simple English Wikipedia, the free encyclopedia
Incandescent light bulb - Wikipedia
Incandescent Lamp Application Information - VCC
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How an Incandescent Light Bulb Works — 1000Bulbs.com Blog
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Improving the Efficiency of Tungsten Filament Light Bulbs
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