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Evolution of the Lightbulb
Joseph Swan receives a patent for an incandescent bulb
Edison begins to work on incandescent bulbs
Edison works on incandescent bulbs
1878 - 1880
Edison patents a bulb
Edison has to work with Swan as a consequence.
Edison has the same model of bulb that Swan made 10 years before.
Joseph Swan, a British inventor, sues Edison for patent infringement
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