early lightbulb - Kids | Britannica Kids | Homework Help
In October 1879, Edison "perfected" the light bulb | Signify Company Website
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Bulb Still Burning After 100-Plus Years as GE Brings Business Back to US - ABC News
Edison's light bulb turns 135 | National Museum of American History
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Incandescent light bulb - Wikipedia
These Edison era light bulbs just fetched $30K at U.S. auction | CBC Radio