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15/11/1883 Thomas Edison was granted a patent on his two-element vacuum tube

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Who Really Invented The Light Bulb - History of Everything

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Class 5, Part 2: Innovation Systems at Institutional Level & Organization of Federal Science Sup...

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Who Really Invented the Radio?

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Class 7, Part 1: The Organization of Innovation Systems at the Face-to-Face Level

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Top 10 Greatest Inventions by Nikola Tesla