22 мая 1849 года Авраам Линкольн запатентовал конструкцию плавучего сухого дока

Not yet a president but still a lawyer, Abraham Lincoln received U.S. Patent No. 64,469 for his design of a floating dry dock. Lincoln was a patent law specialist and gave public lectures on the subject. Lincoln said the patent system adds a fuel of interest to the fire of genius.