proved, from that time and for the full life of the Patent no other person can manufacture, process or prepare said articles or those similar to them for consumption in the national territory, violators being subject to the civil and criminal liabilities established by the laws in force, and all of said articles, without exception, which are imported from abroad for whatever time or purpose in said period, shall be subject to a duty or tax, as a surcharge, and without changing the present ones, equivalent to 50 per cent. ad valorem, which shall be definitively collected by Customs Houses as a protective tariff margin, the Government also taking whatever measures are necessary to prevent dumping and other illegitimate practices. In the application of the Customs surtaxes established in this paragraph the text of international treaties now existing shall be respected so long as they are in force.
The owner of an Industrial Introduction Patent shall be entitled, during all the time that it is in force, to import without limitations or restrictions the machinery and materials intended for establishing the industry, as well as all raw materials employed or utilised for the production, processing of preparation of the article in question, if they are not duty free, with a reduction of 80 per cent. in the taxes and Customs duties applicable to them in accordance with the Customs Tariff in force on the date the patent is granted; and during the life of the patent no change whatever shall be made in said exemptions or taxes and duties, nor in the fees, taxes, charges or contributions of an internal character that are applicable to such importations on said date, after their entry into the national territory, or to the industries covered by the patent; the articles produced by these industries being exempt from internal taxes, fees, charges or exactions or those of any other kind, of the Nation, the Provinces and the Municipalities, different from or greater than those payable on analogous articles of domestic origin or from another foreign country; and in no case can any provision whatever be issued that is detrimental to the rights covered by the Patent; nor can the Patent be altered, suspended or lapsed, except by completion of its term or by default, after a decision rendered in every case by the corresponding courts.
4. Owners of Industrial Introduction Patents must utilise in their industries the raw materials produced in the national
