Effective duty rates substituted for specified tariff items under Customs notification amendment, altering exemption and duty structure. Amendment substitutes revised effective duty rates in the Table to Notification No. 21/2002-Customs: column (4) entries for items (A), (B) and (C) against S.No. 34 are substituted with a revised rate, and the column (4) entry for S.No. 434 is substituted. The substitution is effected by Notification No.58/2007-Customs under powers conferred by the Customs Act, with reference to the principal notification and its last amendment.