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I can't find any evidence that the X stood for X-Ray but lots that it was an X for X organisation, as the series naming suggests Personal blog 20:24, 5 January 2011 (UTC) — Preceding unsigned comment added by JimKillock ( talk • contribs)

http://www.dcs.bbk.ac.uk/50years/50yearsofcomputing.pdf

©Geni ( talk) 21:00, 31 May 2015 (UTC) reply