Custody of records: Registrar controls tribunal records; removal requires tribunal leave, limited administrative delegation. Custody of the records is vested in the Registrar, who shall maintain and control all records and documents of the Appellate Tribunal; no record or document filed in any case or matter may be removed from the Tribunal's custody except with the leave of the Appellate Tribunal, though the Registrar may permit another officer to remove official papers or records for administrative purposes.