On June 26, 1797, U.S. Patent X177 on a plough, issued to Charles Newbold.

This was the first U.S. patent on a plough, and was followed a steady stream of improvements in agricultural technology. One of the more peculiar of which was the combination plow and cannon, patented by French & Fancher in 1862 (U.S. Patent No. 36600), which must have made the plow-horse very nervous.