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Grant Pridecohttp://www.grantprideco.com/default.asp
Hydrilhttp://www.hydril.com
JFE Steelhttp://www.jfe-steel.co.jp/en/
Mitsui & Co. (U.S.A.), Inc.http://www.mitsui.com/index.shtml
Nippon Steelhttp://www.nsc.co.jp/en/index.html
V&M Star, V&M Tubehttp://www.vmtubes.com