13 nov 1879 - Thomas Edison The lightbulb

Description:

Thomas Edison and his team of researchers tested more than 3,000 designs for bulbs between 1878 and 1880. In November 1879, He filed a pattent for a bulb and spent the next year finding the perfect filament for his new bulb, testing more than 6,000 plants to determine which material would burn the longest.

https://www.livescience.com/43424-who-invented-the-light-bulb.html

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