Section 9
SEC. 9. All materials imported into the Philippine Islands from the United States or foreign countries for the construction or equipment of said railroads which shall really and actually be used for such construction and equipment, shall be admitted free of duty. In no case shall such imported materials be sold or used for purposes other than the construction and equipment of said railroads, unless the Secretary of Finance shall be convinced that they have ceased to be necessary for such construction and equipment and that the customs duties on such materials have thereupon been duly paid.