The British Mark V tank was an upgraded version of the Mark IV tank, deployed in 1918 and used in action in the closing months of World War I, in the Allied intervention in the Russian Civil War on the White Russian side, and by the Red Army. Thanks to Walter Wilson's epicyclic gear steering system, it was the first British heavy tank that required only one man to steer it
WWII Enigma Cipher Machine. This highly important three-rotor Enigma deciphering machine was used by the Nazis during World War II. It is believed that acquisition of an Enigma, and the subsequent deciphering of the German codes by the Allies, shortened the war in Europe by at least two years. Examples of Enigma machines are exceptionally rare and almost all known models are in museums.