law: 83. Appeal to High Court against order of Authority or Board.-
  Any person or establishment aggrieved by the decision of the Authority or a Board may, within a period of thirty days from such decision, prefer an appeal to the High Court of the State in which the Board is situated:
  Provided that the High Court may entertain an appeal after the expiry of the said period of thirty days, if it is satisfied that the appellant had sufficient cause for not preferring the appeal within the period of thirty days.