General hard - For a device he created that aids Buoying Vessels Over Shoals, who is the only U.S. president ever awarded a patent?

0 / 60 seg.

For a device he created that aids Buoying Vessels Over Shoals, who is the only U.S. president ever awarded a patent?

Question: 1 / 1135 - Correct: 0 - Streak: ☆☆☆☆☆

Previous question