Effective rate of duty extended to cement made from in house clinker, widening eligibility under excise notification. Amendment substitutes the words 'against S. No. 1 or S. No. 2' for 'against S. No. 2' in clause (a) of proviso 2 of Notification No. 5/94-Central Excises, thereby extending the effective rate of duty to include cement produced from clinker manufactured within the same factory when covered by the amended serial references.