Rescission of customs anti-dumping notification withdraws prior instrument while preserving actions completed before rescission under the Act. The Central Government, exercising powers under the Customs Tariff Act and the anti-dumping rules, rescinds Notification No. 69/2001 relating to anti-dumping tariff procedures. The rescission operates prospectively and expressly preserves acts done or omitted to be done before such rescission, so that completed actions under the earlier notification are unaffected.