What this order does: Declares that "parts, rolling mill main drive, being AC motor bases or sub‑bases" (tariff heading 8503.00.00) are goods to which Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995 applies, effective 15 Nov 2011 (s269P Customs Act 1901; revocation ss269SC–269SD). Mechanically, it changes how imports of those parts are treated under the tariff, so importers and the customs decision‑maker must apply the Schedule 4 concession and meet any classification or record requirements.