The dominant issue was whether imported roller conveyors and...

The dominant issue was whether imported roller conveyors and sorter conveyors were classifiable as "parts" under Heading 8431 or as conveyors under Heading 8428. Heading 8431 was held inapplicable because it is confined to parts solely or principally suitable for machinery of Headings 8425-8430, whereas the goods are complete, independently operating mechanical units performing distinct functions of moving and sorting goods. Relying on WCO Explanatory Notes and the interpretative principle that independently functional machinery is classified under the heading describing the machine rather than parts provisions, the goods were held classifiable under CTI 84282019 ("Other conveyors"). - AAR

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