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U.S. Phase-Out of Incandescent Light Bulbs Continues in 2014 with 40-, 60-Watt Varieties
Phase-out of incandescent light bulbs - Wikipedia
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Swift 120V 20W Tungsten Bulb (SWMA2201) - New York Microscope Company
U.S. speeds up phaseout of incandescent light bulbs : NPR
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