Skip hoists are purpose-built inclined or vertical conveyances used to raise bulk materials such as ore or coal in mining and construction, and they are classified in heading 8428 with other continuous or specialized lifting machinery. Hoists in 8425 are general-purpose lifting devices — chain hoists, wire-rope hoists, and similar equipment — not designed for bulk-material skip-type operation.

Combination units are classified by their principal function. If the device primarily operates as a winch (pulling or hauling loads horizontally or at an angle), it falls under 842531 or 842539 depending on whether it is electrically powered. If the capstan function predominates — typically for rope or cable handling in marine applications — the same subheadings apply, as winches and capstans share the same subheading structure. A binding ruling from CBP is advisable for ambiguous multi-function units.