Delegation of Customs Board powers: principal collectors authorised to declare warehousing stations, extend warehousing period and apply export proviso. The Central Government authorises Principal Collectors of Customs and of Customs and Central Excise, as notified, to exercise specific powers of the Central Board of Excise & Customs under the Customs Act within their jurisdictions. Delegated powers include declaring warehousing stations, extending warehousing periods, and applying the proviso concerning goods entered for export within three years of duty payment; the delegation supersedes an earlier notification and applies only to the specified notified Principal Collectors.