The Central Government may, in accordance with the provisions of sub-section (2) of section 9 of the Act, impose a provisional duty on the basis of the preliminary findings recorded by the designated authority:

Provided that no such duty shall be imposed before the expiry of sixty days from the date of issue of the public notice by the designated authority regarding its decision to initiate investigations :

Provided further that such duty shall remain in force for a period not exceeding four months.