Sept. 1968 before Dept. for Registration of Corporations Behshahr and subsequently based on decision of the extraordinary general meeting of shareholders dated 9 March 1968 the head office company was moved to Tehran and duly registered under No. 13190 before Dept. for Registration of Corporations and Industrial Property –Tehran. The company was converted to Public Joint Stock on 12 March 1994 and was admitted to Stock Exchange Market of Tehran.