Case T-422/10: Judgment of the General Court of 15 July 2015 — Trafilerie Meridionali v Commission (Competition — Agreements, decisions and concerted practices — European prestressing steel market — Price fixing, market sharing and exchanging of sensitive commercial information — Decision finding an infringement of Article 101 TFEU — Single, complex and continuous infringement — Proportionality — Principle that penalties must fit the offence — Unlimited jurisdiction)