Who actually invented the incandescent lightbulb and when?
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Edison's Lightbulb | The Franklin Institute
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Who Invented the Lightbulb?
Ask History: Who Really Invented the Light Bulb? | History - YouTube
Who Invented The Lightbulb? The Story Of The First Incandescent Bulb
Who Invented the Bulb? | First Bulb History, Time Line & Evolution | InforamtionQ.com
