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These Edison era light bulbs just fetched $30K at U.S. auction | CBC Radio
In October 1879, Edison "perfected" the light bulb | Signify Company Website
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Great Influencers in Energy: Thomas Edison may not have invented the light bulb; but where would it (or we) be without him. - Opinion Dynamics
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Thomas Edison Invents Light Bulb and Myths About Himself | Time
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Who Invented the Light Bulb? It Wasn't Just Edison | HowStuffWorks
