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If your refrigerator has any produce from your local grocery store, then you can credit African American inventor Frederick McKinley Jones. Jones took out more than 60 patents throughout his life, including a patent for the roof-mounted cooling system that’s used to refrigerate goods on trucks during extended transportation in the mid-1930s. He received a patent for his invention in 1940, and co-founded the U.S. Thermo Control Company, later known as Thermo King. The company was critical during World War II, helping to preserve blood, food and supplies during the war (History Channel).