Factor of safety: Revision history

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19 November 2014

27 February 2014

28 November 2013

24 July 2012

  • curprev 16:0516:05, 24 July 2012 en>Bobrayner 14,322 bytes +14,322 Unsourced commentary. (By the way, it's preservation bias; only the best-built and best-maintained ones survive.)