Central Excise amendment removes a proviso from a scheduled exemption, altering tariff exemption scope under rule authority. The Central Government, under sub-rule (1) of rule 8 of the Central Excise Rules, 1944, amends Notification No. 34/86-Central Excises by omitting the proviso in S. No. (2) of the Schedule to that notification, thereby altering the operative terms of the listed exemption.