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8. (a) The provisions of this Article shall not apply to laws, regulations or requirements governing the procurement by governmental agencies of products purchased for governmental purposes and not with a view to commercial resale or with a view to use in the production of goods for commercial sale. (&) The provisions of this Article shall not prevent the payment of subsidies exclusively to domestic producers, including payments to domestic producers derived from the proceeds of internal taxes or charges applied consistently with the provisions of this Article and subsidies effected through governmental purchases of domestic products. 9. The Members recognize that internal maximum price control measures, even though conforming to the other provisions of this Article, can have effects prejudical to the interests of Member countries supplying imported products. Accordingly, Members applying such measures shall take account of the interests of exporting Member countries with a view to avoiding to the fullest practicable extent such prejudicial •effects. Article 19 Special Provisions relating to Cinematograph Films The provisions of Article 18 shall not prevent any Member from establishing or maintaining internal quantitative regulations relating to exposed cinematograph films. Any such regulations shall take the form of screen quotas which shall conform to the following conditions and requirements : (a) Screen quotas may require the exhibition of cinematograph films of national origin during a specified minimum proportion of the total screen time actually utilized over a specified period of not less than one year, in the commercial exhibition of all films of whatever origin, and shall be computed on the basis of screen time per theatre per year or the equivalent thereof. ,(b) With the exception of screen time reserved for films of national origin under a screen quota, screen time, including screen time released by administrative action from time reserved for films of national origin, shall not be allocated formally or in effect among sources of supply. ■(c) Notwithstanding the provisions of subparagraph (b) any Member may maintain screen quotas conforming to the requirements of subparagraph (a) which reserve a minimum proportion of screen time for films of a specified origin other than that of the Member imposing such screen quotas ; Provided that such minimum proportion of screen time shall not be increased above the level in effect on April 10, 1917. (d) Screen quotas shall be subject to negotiation and shall accordingly be treated as customs duties for the purpose of Article 17.