In which country did Joseph Swan receive his patent for an incandescent lamp before Edison's patent in the US?
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Joseph Swan developed his own working light bulb in England and received a British patent in 1880. To avoid a costly legal battle over who invented the bulb first, Edison and Swan merged their British operations to form the famous Edison and Swan Electric Light Company. Photo: The original uploader was Maximus Rex at English Wikipedia., Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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