46Although the principle of partial use operates to ensure that trade marks which have not been used for a given category of goods are not rendered unavailable, it must not, however, result in the proprietor of the earlier trade mark being stripped of all protection for goods which, although not strictly identical to those in respect of which he has succeeded in proving genuine use, are not in essence different from them and belong to a single group which cannot be divided other than in an arbitrary manner. The Court observes in that regard that in practice it is impossible for the proprietor of a trade mark to prove that the mark has been used for all conceivable variations of the goods concerned by the registration. Consequently, the concept of ‘part of the goods or services’ cannot be taken to mean all the commercial variations of similar goods or services but merely goods or services which are sufficiently distinct to constitute coherent categories or subcategories.
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