Tariff Concession Order 0843786 declares that specific air conveyors/air slides used in pneumatic alumina handling or distribution are goods to which Item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995 applies, effective 11 December 2008. Made under s269P of the Customs Act 1901, it changes the tariff treatment that applies to those imported machines. This matters to importers of that equipment because it alters which Schedule 4 concession (Item 50) governs their customs treatment until the Order is revoked under ss269SC or 269SD.