Abraham Lincoln's mechanical mind -- Lincoln's lecture on discoveries and inventions : the unknown draft -- Appendix 1 : patent no. 6.469, May 22, 1849, Buoying vessels over shoals, Abraham Lincoln, ...
On May 22, 1849, only three months after the native Kentuckian celebrated his 40th birthday, the United States Patent Office issued Patent No. 6,469 for a device "buoying vessels over shoals." The ...
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