Article 35

In addition to the grounds for revocation provided for in Articles 19 and 20, the rights of the proprietor of a collective mark shall be revoked on the following grounds:
(a) the proprietor does not take reasonable steps to prevent the mark being used in a manner that is incompatible with the conditions of use laid down in the regulations governing use, including any amendments thereto mentioned in the register;
(b) the manner in which the mark has been used by authorised persons has caused it to become liable to mislead the public in the manner referred to in Article 31(2);
(c) an amendment to the regulations governing use of the mark has been mentioned in the register in breach of Article 33(2), unless the proprietor of the mark, by further amending the regulations governing use, complies with the requirements of that Article.