31The matters capable of demonstrating that the mark has come to identify the product or service concerned must be assessed globally and, in the context of that assessment, the following items may be taken into consideration: the market share held by the mark; how intensive, geographically widespread and longstanding use of the mark has been; the amount invested by the undertaking in promoting the mark; the proportion of the relevant class of persons who, because of the mark, identify goods as originating from a particular undertaking; and statements from chambers of commerce and industry or other trade and professional associations (judgment in Joined Cases C-108/97 and C-109/97 Windsurfing Chiemsee [1999] ECR I-2779, paragraphs 49 and 51).
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