9017.90.01.20 - Of articles of subheading 9017.20.40

This HTS classification, 9017.90.01.20, specifically covers parts and accessories for drawing, marking-out, or mathematical calculating instruments, and hand-held length measuring instruments that fall under subheading 9017.20.40. This means the components or accessories classified here are intended for use with particular types of drafting machines, pantographs, or drawing sets that are further defined by their specific construction or features within the broader category of drawing instruments.

Distinguishing this category from its siblings relies heavily on the specific subheading referenced in its description. While other sibling categories in 9017.90.01 also pertain to parts and accessories, they are linked to different subheadings (e.g., 9017.10.40, 9017.20.70). Therefore, the key differentiator for 9017.90.01.20 is the direct association with the instruments described in 9017.20.40, which typically encompass a particular range of technical drawing and drafting tools.

As this is a leaf node, there are no further subcategories within 9017.90.01.20. Classification at this level requires a careful examination of the specific part or accessory to ensure it is indeed intended for an instrument classified under 9017.20.40, rather than another type of drawing, calculating, or measuring instrument covered by different subheadings within Chapter 90. The nature, function, and design of the part or accessory will be critical in making the correct determination.