law: 10. Appeal against non-registration or cancellation.
  Any person aggrieved by a decision of the Registration Committee under section 9 may, within a period of thirty days from the date on which the decision is communicated to him, appeal in the prescribed manner and on payment of the proscribed fee to the Central Government whose decision thereon shall be final:
  Provided that the Central Government may entertain an appeal after the expiry of the said period, if it is satisfied that the appellant was prevented by sufficient cause from filing the appeal in time.