120According to case-law, where a number of legal persons may be held personally liable for participation in an infringement of the European Union’s competition rules because they form part of a single undertaking responsible for the infringement, the Commission has the power, under Article 23(2) of Regulation No 1/2003 to impose a fine for which those persons are jointly and severally liable (see, to that effect, Commission v Siemens Österreich and Others and Siemens Transmission & Distribution and Others v Commission, paragraphs 39 to 51).
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