Spy gadgets have been used to turn the tide of war throughout all of human history. Perhaps one of the most famous examples of a clandestine machine was the Enigma device during the Second World War. A number of electro-mechanical units that worked across a rotor cipher principle were built by German industries, and termed Enigma machines. Arthur Scherbius invented the device at the end of the First World War, and commercial, government and military agencies in several nations used them during the interwar period. The models used by the Wehrmacht during WWII, however, were remarkably advanced.
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