Tariff schedule amendments revise product classifications and replace descriptive entries, altering duty descriptions and unit charge expressions. Amendments to the First Schedule of the Customs Tariff Act under the Finance Act, 1989 substitute, insert or omit wording in multiple chapters to revise product descriptions, technical terminology and tariff column entries, including specified changes to heading and subheading descriptions, note clauses, and duty formulations, thereby altering classification language and stated rates or unit charges across the Schedule.