page 30  Article 138: The certificate holder shall also be entitled to assign or bequeath the utility model and to sign licensing contracts. Article 139: The holder of the utility model certificate shall be entitled to institute judicial proceedings before the competent judge against any party who counterfeits a utility model certificate by performing, without his consent, one of the acts which are mentioned in Article 137 or which make it likely that counterfeiting will be committed. Section 8. Limitation of rights conferred by utility model certificates Article 140: The rights arising from a utility model certificate shall not cover: 1. acts relating to goods placed on sale in Burundi or in any other country by the holder of the utility model certificate or with his consent which lead to the exhaustion of the rights of the holder of the utility model certificate; 2. the use of goods on board aircraft, land vehicles or foreign vessels which enter, temporarily or accidentally, the airspace, territory or waters of Burundi; 3. acts relating to utility model certificates which are performed solely for purposes of experimentation in the case of scientific and technical research; 4. acts performed by any party who, in good faith, before the date of filing or, if priority is claimed, on the date of priority of the application on the basis of which the certificate is granted, used the utility model certificate or made effective and serious preparations to use it in the case of acts which do not differ in terms of their nature or purpose from the previous effective or envisaged use; 5. acts by a person who makes, manufactures, uses or sells a utility model certificate solely for purposes which are reasonably related to the gathering and transmission of information required by a law in Burundi or a country other than Burundi regulating the manufacture, use or sale of any product. Article 141: The user’s right referred to in Article 140 may only be transferred or devolved with the firm or the company or the part of the firm or company in which the use or preparations for use took place. Article 142: Without prejudice to the provisions of Article 140, the Minister responsible for trade shall be entitled to declare on his own initiative or at the request of any interested party that the rights conferred by the utility model certificate have been exhausted and to authorize third parties to import the product produced directly or indirectly by means of a utility model certificate from another territory if this product is not available in the territory of Burundi or is available in insufficient quantity or quality to meet local demand or at prices which the Minister deems abusive or on any other grounds of public interest, including anti-competitive practices, provided that: