Extension of customs exemption notification extends statutory expiry date, prolonging applicability of the prior notification provisions. The Central Government, invoking statutory authority under Section 25(1) of the Customs Act, 1962, amends Notification No. 215/88-Customs by substituting in paragraph 2 the figures, letters and word '30th June, 1989' with '30th June, 1990', thereby extending the expiry date of the referenced exemption notification.