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Machine gun - Wikipedia
List of machine guns - Wikipedia
Machine gun | History, Description, & Facts | Britannica
Introduction - The Machine Gun: Its History, Development and ...
Machine Guns: The History and Evolution of Rapid Fire
How the Machine Gun Revolutionized Warfare - HowStuffWorks
M2 Machine Gun History: Why It’s Still in Use After 105 Years
Medium machine gun - Wikipedia
Machine Gun on the Western Front | Military History Matters
Small arm - Machine Guns, Automatic Fire, Recoil Operation ...