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Today in History: Thomas Edison invents a commercially practical incandescent light

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Today in History: Thomas Edison invents a commercially practical incandescent light
On this day in 1879, Thomas Edison invented a commercially practical incandescent light at his industrial research lab in Menlo Park, New Jersey. Edison had filed his first patent application for “Improvement In Electric Lights” in October 1878. The first successful test was on October 22, 1879, and lasted 13.5 hours. Historians list 22 inventors of incandescent lamps prior to Thomas Edison but Edison’s, although not first light bulb, is considered to be the first practical incandescent lamp.
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