Anti-dumping duty extension preserves protection on flexible slabstock polyol pending statutory continuation review and enforcement. The Central Government amended the original anti-dumping notification to continue the anti-dumping duty on Flexible Slabstock Polyol, invoking statutory powers under the Customs Tariff Act and applicable anti-dumping rules. The amendment adds a paragraph expressly maintaining the duty in force for an additional period unless revoked, following initiation of a continuation review by the designated authority and the procedural request to extend the measure.