Cancellation of certificate.
56. (1) A certificate of registration shall stand cancelled when the name of the holder of the certificate is removed from the register under these rules.
(2) When the name of the holder of the certificate is removed from the register, the [Chief Commissioner or Commissioner] maintaining the register shall notify the fact of such removal to the authorised income-tax practitioner concerned and also to other [Chief Commissioners or Commissioners] of Income-tax (who shall notify the fact of the removal to the income-tax authorities subordinate to them) and to the Appellate Tribunal.