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editThis article seems to be about an important class of drilling, one widely used in various industries today, but needs some work. I tried to clean up what I could, but this article can certainly use more help.Theseeker4 (talk) 16:59, 20 October 2008 (UTC)
- did some, added some refs too--Kelapstick (talk) 17:36, 24 October 2008 (UTC)