Cases T-413/10 and T-414/10: Judgment of the General Court of 15 July 2015 — Socitrel 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 — Cooperation during the administrative procedure — 2006 Guidelines on the method of setting fines — Reasonable time)