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To list every single one would not be feasible. As for types, some of the types invented after 1920 include..
General Purpose Machine Guns
Guided Missiles
Assault Rifles
The modern tank
Personal Defense Weapons (PDWs)
Grenade launchers
Anti-tank rockets and missiles
Jet aircraft
Helicopter gunships
What else can I help you with?
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Band-Aid was invented in 1920.
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