Judgment of the Court of First Instance of 11 December 2003 in Case T-59/99: Ventouris Group Enterprises SA v Commission of the European Communities (Competition Regulation (EEC) No 4056/86 — Investigations carried out at company premises other than those of the company to which the investigation decision is addressed Article 85(1) of the EC Treaty (now Article 81(1) EC) — Price-fixing — Proof of infringement Error of assessment of the facts — Fines — Proportionality — Mitigating circumstances)