Who is the only U.S. President to invent and patent something?

1. 

Who is the only U.S. President to invent and patent something?
[A]. Abraham Lincoln
[B]. Theodore Roosevelt
[C]. Thomas Jefferson
[D]. Rutherford B. Hayes

Answer: Option A

Explanation:

In 1849 Honest Abe invented a method to aid ships that got stuck on sandbars. He called it A Device for Buoying Vessels Over Shoals. It was never used.

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