File:Mystery1.jpg
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"Cryptanalytic working aid used at Bletchley Park", from the Science Museum Turing exhibition.
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current | 00:30, 22 June 2012 | 768 × 1,024 (116 KB) | Craig (Talk | contribs) | "Cryptanalytic working aid used at Bletchley Park", from the Science Museum Turing exhibition. |
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