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Little Boy

Little Boy was the name of the type of atomic bomb used in the bombing of the Japanese city of Hiroshima on 6 August 1945 during World War II, making it the first nuclear weapon used in warfare. Wikipedia
Date: August 6, 1945
Blast yield: 15 kilotons of TNT (63 TJ)
Diameter: 28 inches (71 cm)
Length: 10 feet (3.0 m)
Mass: 9,700 pounds (4,400 kg)
No. built: 1 wartime + 5 postwar