(5)The Central Government may, pending the determination under sub-section (1), apply provisional safeguard measures under this sub-section on the basis of a preliminary determination that increased imports have caused or threatened to cause serious injury to a domestic industry:Provided that where, on final determination, the Central Government is of the opinion that increased imports have not caused or threatened to cause serious injury to a domestic industry, it shall refund the safeguard duty so collected:Provided further that any provisional safeguard measure shall not remain in force for more than two hundred days from the date on which it was applied.