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Lone Star Steel is a subsidiary of Lone Star Technologies Inc., (NYSE: LSS) a management and holding company whose operating companies are Lone Star Steel, Fintube Technologies and Bellville Tube. Those operating subsidiaries manufacture and market oilfield casing, tubing and line pipe; specialty tubing products including finned tubes used in heat recovery applications for combined-cycle electrical power generation, and flat-rolled steel and other tubular products and services.