Concessional Duty Exemptions reduce customs tariffs for specified developing countries' imports under trade preferences, subject to origin proof. Exempts specified imports from a portion of the standard customs duty when imported from countries listed under the Belgrade trade-preferences Agreement, by reference to a Table that pairs goods with First Schedule tariff headings and specifies percentage tariff concessions. Importers must prove origin under the Agreement's Rules of Origin to customs authorities. A higher special concession percentage applies to certain goods when imported from Less Developed Countries listed in Appendix II. The notification defines standard rate scope and notes specified exclusions and prior amendments.