2004/421/EC: Commission Decision of 16 December 2003 relating to a proceeding under Article 81 of the EC Treaty and Article 53 of the EEA Agreement against Wieland Werke AG, Outokumpu Copper Products OY, Outokumpu Oyj, KM Europa Metal AG, Tréfimétaux SA and Europa Metalli SpA (Case C.38.240 — Industrial tubes) (Text with EEA relevance) (notified under document number C(2003) 4820)