Any safeguard measure imposed under rule 10 or rule 12 shall be on a non-discriminatory basis and applicable to all imports of such article, irrespective of its source.

provided that no such measure shall be applied on an article originating from a developing country so long as the share of imports of that article from that country does not exceed three per. cent or where the article is originating from more than one developing country, then, so long as the aggregate of the imports from each of such developing countries with less than three per. cent import share taken together, does not exceed nine per. cent of the total import of that article in India