GST classification confirms high-rate tax applies until scheduled expiry for specified goods and prior exemption was omitted. GST classification of goods under tariff heading 9023 is in Schedule 4 and carries a high applicable GST rate; the descriptive provision for demonstrational instruments, apparatus and models previously identifying items designed for demonstration and unsuitable for other uses has been omitted by notification, narrowing the prior descriptive exemption and thereby affecting the scope of goods subject to the tariff entry.