Case T-517/09: Judgment of the General Court of 27 November 2014 — Alstom v Commission (Competition — Agreements, decisions and concerted practices — Power transformers market — Decision finding an infringement of Article 81 EC and Article 53 of the EEA Agreement — Effect on trade between Member States — Concept of undertaking — Imputability of the unlawful conduct — Presumption of actual exercise of decisive influence by a parent company over the conduct of the subsidiary — Duty to state reasons)