Case C-466/07: Judgment of the Court (Fourth Chamber) of 12 February 2009 (reference for a preliminary ruling from the Landesarbeitsgericht Düsseldorf (Germany)) — Dietmar Klarenberg v Ferrotron Technologies GmbH (Social policy — Directive 2001/23/EC — Transfer of undertakings — Safeguarding of employees' rights — Concept of legal transfer — Legal transfer of a part of a business to another undertaking — Organisational autonomy following the transfer)