Tommy gun Thompson Submachine Gun Caliber 45

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The Thompson submachine gun (also known as the Tommy Gun, Chicago Typewriter, Chicago Piano, or Trench Broom) is a blowback-operated, air-cooled, magazine-fed selective-fire submachine gun, invented by the United States Army Brigadier general John T. Thompson in 1918. It was originally designed to break the stalemate of trench warfare of World War I, but was not finished until after the war ended.