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Category:PURPLE cipher machine - Wikimedia Commons
The Coming of the Machines: 1918–1945
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The Friedmans at War: William
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Category:National Cryptologic Museum – Wikimedia Commons
File:Japanese Enigma-type rotor cipher machine - National Cryptologic Museum - DSC07874.JPG - Wikimedia Commons
Category:PURPLE cipher machine - Wikimedia Commons
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Colossus computer - Wikipedia
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