Incandescent light bulb - Wikipedia
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Incandescent light bulb - Wikipedia
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Edison light bulb - Wikipedia
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Incandescent light bulb - Wikipedia
/cloudfront-us-east-1.images.arcpublishing.com/gray/DR47BOT2YFHZZGLW5RHFF7HZXU.jpg "Earth Day: LED lights could cut utilities by 60 percent")
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Incandescent light bulb - Wikipedia
Incandescent light bulb - Wikipedia
Phase-out of incandescent light bulbs - Wikipedia
