The technical specifications may not mention a particular manufacturing method or process or a specific provenance or origin, or refer to a trade mark, patent or type where such mention or reference is likely to favour or eliminate certain economic operators or certain products.
However, such a statement or reference is possible if it is justified by the subject of the contract or, exceptionally, in cases where a sufficiently precise and intelligible description of the subject of the contract is not possible without it and provided that it is accompanied by the words “or equivalent”.