関連ワード:  when was the first machine gun invented    when was the first gatling gun invented    when was the first submachine gun invented    when was the first machine pistol invented    when was the first machine gun made    when was the first handheld machine gun invented    when was the first automatic machine gun invented    when was the first light machine gun invented    when was the first machine gun made in ww1    when was the first sub machine gun made  
結果 : when was the first machine gun invented