Joined Cases T-122/07 to T-124/07: Judgment of the General Court of 3 March 2011 — Siemens Österreich and Others v Commission (Competition — Agreements, decisions and concerted practices — Market in gas insulated switchgear projects — Decision finding an infringement of Article 81 EC and Article 53 of the EEA Agreement — Market-sharing — Effects within the common market — Notion of continuous infringement — Duration of the infringement — Limitation period — Fines — Proportionality — Ceiling of 10 % of turnover — Joint and several liability for payment of a fine — Mitigating circumstances — Cooperation — Rights of the defence)