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editArticle should be updated to include modern usage of this system in some industries, particularly in plastic pipes. It is not a legacy system of sizing as indicated in the article. BluSkyy (talk) 20:01, 20 June 2011 (UTC)
Reference to Thomas Link doesn't exist anymore. Use Webarchive: https://web.archive.org/web/20061109061202/http://www.thomas-insulation.com/publications/products/ips-cts-sizinggraphic.pdf
Forum link here: http://www.eng-tips.com/viewthread.cfm?qid=336095 provides good insight to history. — Preceding unsigned comment added by Piping wizard (talk • contribs) 14:06, 17 January 2014 (UTC)