28Moreover, according to the settled case-law of the Court, the essential function of the trade mark is to guarantee the identity of the origin of the marked product to the consumer or end user by enabling him, without any possibility of confusion, to distinguish the product or service from others which have another origin. For the trade mark to be able to fulfil its essential role in the system of undistorted competition which the Treaty seeks to establish, it must offer a guarantee that all the goods or services bearing it have originated under the control of a single undertaking which is responsible for their quality (see, in particular, Case C-10/89 HAG GF (HAG II) [1990] ECR I-3711, paragraphs 14 and 13).
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