The idea that Thomas Edison stole the invention of the light bulb from Nikola Tesla is a common myth, but it is not true. While Tesla did make important contributions to the development of early electromagnetic devices, such as the induction motor and AC power distribution system, the idea for the light bulb predated both Tesla's and Edison's contributions. In fact, the first known patent for an incandescent lamp was filed by English engineer Warren De la Rue in 1840, nearly 20 years before Edison and Tesla were born.
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