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 ...
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, ...
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