Court of Justice 13 December 2017, Case C-487/16 P: Judgment of the Court (Sixth Chamber) of 13 December 2017 — Telefónica SA v European Commission (Appeal — Agreements, decisions and concerted practices — Portuguese and Spanish telecommunications markets — Non-competition clause contained in an agreement entered into between two companies — Restriction by object — Rights of defence — Refusal to hear witnesses — Fines — Gravity of the infringement — Mitigating circumstances)

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