301Moreover, by virtue of a general duty of care attaching to any undertaking or association of undertakings, the applicants are required to ensure the proper maintenance of records in their books or files of information enabling details of their activities to be retrieved, in order, in particular, to make the necessary evidence available in the event of legal or administrative proceedings. When the applicants received requests for information from the Commission under Article 11 of Council Regulation No 17 of 6 February 1962, First Regulation implementing Articles [81 EC] and [82 EC] (OJ, English Special Edition 1959-62, p. 87), it was a fortiori incumbent on them to act with greater diligence and to take all appropriate measures in order to preserve such evidence as might reasonably be available to them (see, to that effect, Nederlandse Federatieve Vereniging voor de Groothandel op Elektrotechnisch Gebied and Technische Unie v Commission, cited in paragraph 245 above, paragraph 87).