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Abraham Lincoln is the only president in American history to have a ...
The right answer is: Patent.
In 1849, he received a patent for a flotation device for the movement of boats in shallow water. The idea was never commercialized, but Lincoln is the only president to hold a patent.
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What is the name of Jerome K. Jerome's novel – the continuation of the book "Three Men In A Boat (To Say Nothing Of The Dog)"?