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External links
editComment moved from article text by MarkAJUK:
All these links jump straight out to commercial promotion pages.....take care the list is NOT comprehensive. Missing Hydril, Halliburton etc. This links fails to recognise key issues, refer to API technical Report. Note that there is a significant focus towards eesiflo and sister ventures in these links. Copied by Beechhouse (talk) 10:39, 5 February 2010 (UTC)