Philippine article
(4) The term “Philippine article” means an article which is the product of the Philippines, unless, in the case of an article produced with the use of materials imported into the Philippines from any foreign country (except the United States) the aggregate value of such imported materials at the time of importation into the Philippines was more than twenty per centum of the value of the article imported into the United States, the value of such article to be determined in accordance with, and as of the time provided by, the customs laws of the United States in effect at the time of importation of such article. As used in this paragraph the term “value”, when used in reference to a material imported into the Philippines, includes the value of the material ascertained under the customs laws of the Philippines in effect at the time of importation into the Philippines, and, if not included in such value, the cost of bringing the material to the Philippines, but does not include the cost of landing it at the port of importation, or customs duties collected in the Philippines. For the purposes of this paragraph any imported material, used in the production of an article in the Philippines, shall be considered as having been used in the production of an article subsequently produced in the Philippines, which is the product of a chain of production in the Philippines in the course of which an article, which is the product of one stage of the chain, is used by its producer or another person, in a subsequent stage of the chain, as a material in the production of another article.