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processing or use of products in specified amounts or proportions, should not be applied to imported or domestic products so as to afford protection to domestic production. 2. The products of any Member country imported into any other Member country shall not be subject, directly or indirectly, to internal taxes or other internal charges of any kind in excess of those applied, directly or indirectly, to like domestic products. Moreover, no Member shall otherwise apply internal taxes or other internal charges to imported or domestic products in a manner contrary to the principles set forth in paragraph 1. 3. With respect to any existing internal tax which is inconsistent with the provisions of paragraph 2 but which is specifically authorized under a trade agreement, in force on April 10, 1947, in which the import duty on the taxed product is bound against increase, the Member imposing the tax shall be free to postpone the application of the provisions of paragraph 2 to such tax until such time as it can obtain release from the obligations of such trade agreement in order to permit the increase of such duty to the extent necessary to compensate for the elimination of the protective element of the tax. 4. The products of any Member country imported into any other Member country shall be accorded treatment no less favourable than that accorded to like products of national origin in respect of all laws,, regulations, and requirements affecting their internal sale, offering for sale, purchase, transportation, distribution or use. The provisions of this paragraph shall not prevent the application of differential internal transportation charges which are based exclusively on the economic operation of the means of transport and not on the nationality of the product. 5. No Member shall establish or maintain any internal quantitative regulation relating to the mixture, processing or use of products in specified amounts or proportions which requires, directly or indirectly that any specified amount or proportion of any product which is the subject of the regulation must be supplied from domestic sources. Moreover, no Member shall otherwise apply internal quantitative regulations in a manner contrary to the principles set forth in paragraph 1. 6. The provisions of paragraph 5 shall not apply to any internal quantitative regulation in force in any Member country in July 1, 1939, April 10,1947 or on the date of this Charter, at the option of that Member ; Provided that any such regulation which is contrary to the provisions of paragraph 5 shall not be modified to the detriment of imports and shall be subject to negotiation and shall accordingly be treated as a customs duty for the purposes of Article 17. 7. No internal quantitative regulation relating to the mixture, processing or use of products in specified amounts or proportions shall be applied, in such a manner as to allocate any such amount or proportion among external sources of supply.