Who Invented the Lightbulb? - ThoughtCo
https://www.thoughtco.com/who-invented-the-lightbulb-1991698
WEBMar 16, 2019 · On October 21st, 1879, in one of the most famous scientific tests in history, Thomas Edison debuted his signature invention: a safe, affordable, and easily-reproducible incandescent lightbulb that burned for thirteen and a half hours. Bulbs tested following that lasted for 40 hours.
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