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Inventor denied patent because he was a slave:

Inventor denied patent because he was a slave:

Science

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https://paleofuture.gizmodo.com/the-story-of-the-american-inventor-denied-a-patent-beca-1828329907

He invented a lot of things but the one he tried to get a patent on would have revolutionized the paddlewheel river boats of the era.

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