Rescission of Central Excise notifications under Section 5A terminates specified prior exemptions and fixes the notified commencement. Under Section 5A of the Central Excise and Salt Act, 1944 the government rescinds Notification No. 221/85-C.E. and Notification No. 134/87-C.E., withdrawing those prior exemption instruments and declaring the rescission to take effect from the notified commencement date.