10. (1) The Government may, by notification in the official Gazette, declare any industrial undertaking to be a notified industrial undertaking for the purpose of this Ordinance. (2) Every notified industrial undertaking shall report to the Board in such manner and within such period all situations in the undertaking which are vacant or are soon likely to be vacant and employ such essential personnel within such period and on such terms and conditions as the Board may direct and no such industrial undertaking shall, except with the permission of the Board, fill any vacancy in which essential personnel may be employed.