ColossusRebuild_11

Published September 3, 2015 at 607 × 600 in The Home Of Codebreaking: Three Days At Bletchley Park (Part 1)

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MaltaGC at the English language Wikipedia [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons

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