Withdrawal of customs exemptions narrows tariff relief by omitting specified entries from the principal notification, altering exemption scope. Amendment withdraws selected customs exemptions by omitting serial entries 9, 9A, 10 and 10A from the TABLE of Notification No. 39/96 Customs and deleting the corresponding references in paragraph 2 item (ix), exercising powers under section 25(1) of the Customs Act, 1962, and taking effect on the notified commencement date, thereby narrowing the goods eligible for exempt treatment under the principal notification.