This US president is the only one to hold a patent

United States patent number 6,469 is for 'buoying vessels over shoals.' Granted on May 22, 1849, the concept involves equipping large boats with 'india-rubber cloth, or another suitable waterproof fabric' on the hull as inflatable floats. If a boat became stranded, these buoys could be inflated with air to lift it in the water and set it free. — Read the rest
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