4. Power to alter countervailing duties on imported goods in certaincases. -

Where any duty of customs on any of the goods specified in section 2 of the principal Act became leviable under the Indian Tariff Act, 1934 (32 of 1934), forOctober, 1959, by reason of the fact that under that Act such duty, being the excise duty for the time being leviable on like goods if produced or manufactured in India, has to be added to, or levied as the duty of customs, the Central Government may, by notification in the Official Gazette, direct that the duty of customs on any of the said goods for the said period shall be such as may be specified in the notification.