Excise exemption amendments impose minimum duty baselines and add certification and temporal conditions to notifications. The Central Government, invoking section 5A of the Central Excise Act read with the Additional Duties Act, amends multiple notifications to modify exemption scope and levy mechanics: where exempt-clearance articles are not excisable, duty equal to input duty becomes payable at clearance; minimum duty baselines are imposed for goods from export-oriented or duty-exempt units; schedule references, definitions of 'normal rate of duty,' table entries and provisos are substituted or omitted; certification requirements and temporal validity for specific exemptions are added.