What Is a Tungsten Filament? (with pictures)
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U.S. Phase-Out of Incandescent Light Bulbs Continues in 2014 with 40-, 60-Watt Varieties
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Understanding Colour Temperature - Neil Oseman
General Electric National Mazda Drawn Tungsten Filament Incandescent Light Bulb - Science History Institute Digital Collections
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U.S. Phase-Out of Incandescent Light Bulbs Continues in 2014 with 40-, 60-Watt Varieties
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Bumping into new technologies: Hey, that's not what a light bulb is supposed to look like! | National Museum of American History
Phase-out of incandescent light bulbs - Wikipedia
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Tungsten's Brilliant, Hidden History | American Scientist
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How Incandescent Light Bulbs Work — 1000Bulbs.com Blog
Tungsten v. Incandescent | TV Tech
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