[ REPUBLIC OF ANGOLA manual, mechanical or chemical process, whether simple or combined, shall be deemed to be an industrial design. Article 17 (Protected industrial designs) Only new models or industrial designs and those which, although composed of known elements, produce original combinations that lend their respective subject matter an overall appearance that has its own characteristics, may be registered. Article 18 (Unprotected utility models and industrial designs) The following shall not be protected as utility models or industrial designs: a) those which, owing to their description and the claims made for them, have been deemed to be inventions pursuant to this legal instrument; b) works of sculpture, engraving, painting, architecture, photography, enameling or embroidery or any other designs of a purely artistic nature; c) industrial designs contrary to public policy or common decency; d) those in similar conditions to those provided for in Article 4. Article 19 (Novelty of an industrial design) 1. An industrial design shall be new if it has not been disclosed by suitable means in Angola or abroad in such a way that it may be exploited by a person skilled in the art. 2. An industrial design shall not be deemed to be new if it has already been the subject of a deposit, even where the deposit is null and void or has lapsed, in Angola or abroad, or if it has been commonly used or has in any way fallen into the public domain. Article 20 (Rights conferred by the registration of an industrial design) 1. The deposit of an industrial design shall confer the right to its exclusive use throughout Angola by means of the manufacture, sale or exploitation of the object to which the industrial design is applied.