This Order designates a narrowly defined class of programmable mixers (tariff 8479.82.00) — trailer, plant or skid mounted with both hydration tanks and liquid additive tanks — as goods to which Schedule 4, item 50 of the Customs Tariff Act 1995 applies. It changes the tariff treatment on import from 16 December 2009 until revoked. Affected parties are importers of these specific mixers and customs officers; importers must show the goods meet the physical and classification criteria to obtain the Schedule 4 treatment.