22nd May 1849: Abraham Lincoln issued a patent for his invention
Abraham Lincoln - Mini Biography
Future president of the United States o America is granted a patent. As of March 2018, he is only U. S. president to apply for some. His invention was a device for lifting boats over shoals in a river. Lincoln conceived the idea when the boat on which he traveled got hung up on obstructions. Documentation of his patent was discovered in 1997.
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