Gatling gun
While being most known for inventing the Gatling gun, Gatling invented and patented a number of other inventions. His inventions include a screw propeller and a wheat drill (a planting device) in 1839, a hemp break machine in 1850, a steam plow (steam tractor) in 1857, the Gatling gun in 1861, a marine steam ram in 1862, and a motor-driven plow (tractor).