law: 6.Period of operation and cancellation of notification.-
  (1) Subject to the provisions of
  sub-section (2), a notification issued under section 3 shall, if the declaration made therein is confirmed by the Tribunal by an order made under section 4, remain in force for a period of 3[five years] from the date on which the notification becomes effective.
  (2) Notwithstanding anything contained in sub-section (1), the Central Government may, either on its own motion or on the application of any person aggrieved, at any time, cancel the notification issued under section 3, whether or not the declaration made therein has been confirmed by the Tribunal.