Court of Justice 14 March 2013, Case C-276/11 P: Judgment of the Court (Tenth Chamber) of 14 March 2013 — Viega GmbH & Co. KG v European Commission (Appeal — Competition — Agreements, decisions and concerted practices — Copper and copper alloy fittings sector — End-feed fittings and press fittings — Taking and assessment of the evidence — Right to be heard before a court — Obligation to state reasons — Principle of proportionality)

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