12. Frederick McKinley Jones (1892–1961)

Notable inventions: Automatic refrigerator system, military air-conditioning unit, self-start gas engine, and movie projector devices

Jones designed portable cooling units for trucks, trains, ships, and aircrafts to help store and keep products chilled. His invention would play a vital role during World War II, where army hospitals and battlefield infantries preserved blood, food, and medicine in these small-scaled refrigerators. With over 61 patents under his belt, he was definitely a jack-of-all-trades inventor.