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Thomas Edison's Incandescent Electric Lamp Patent. Edison began research into developing a practical incandescent lamp in 1878. He filed his first patent application for "Improvement In Electric Lights" in October 1878. After
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011. First Light Bulb Demonstration, 1879. - Timeline -- United States - Wolfgram Memorial Library Digital Collections
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Invention of the Light Bulb - HISTORY CRUNCH - History Articles, Biographies, Infographics, Resources and More
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