A ring-spinning frame falls under subheading 844520 (Textile Spinning Machines). The spindles and ring travelers used with it are accessories classified separately under heading 8448.

The key is the feedstock. Drawing machines that work on staple or natural fibers as part of the fiber-preparation sequence (reducing slivers to rovings) go under 844513. Drawing machines that elongate manmade filament extruded from a polymer melt belong under heading 8444, which is dedicated to manmade textile material processing.