This order (TCO 0516756) declares that specified dust extraction systems (tariff classification 8421.39.00) are eligible for the Schedule 4, Part III item 50 tariff concession, effective 6 Dec 2005 until revoked under ss 269SC/269SD of the Customs Act 1901. A delegate (Susan Campbell) issued the declaration under s 269P. Importers whose shipments match the listed description may pay the concessional tariff, creating an incentive to import those components and requiring correct classification and supporting documentation.