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Which president was the first—and only—to hold a patent when he received one for inventing a boat lifting device (albeit, one that was never made)?

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Fact: 12 of the US presidents owned slaves, and 8 of them enslaved people while in office.


1. Which president was the first—and only—to hold a patent when he received one for inventing a boat lifting device (albeit, one that was never made)?





 
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