Heading 9033 is explicitly residual — it applies only when no other heading in Chapter 90 provides a more specific parts or accessories provision for the parent instrument. The classification process requires first identifying the parent article's heading (e.g., 9031, 9032), then checking whether that heading has a dedicated parts subheading. If a specific parts line exists and the component qualifies, that line takes precedence over 9033. Only when no specific provision covers the part does 9033 apply.

Yes — 9033003000 specifically covers touch screens without display capability, meaning the panel detects pressure and location of touch but does not itself generate an image. A touch screen that incorporates an integrated display (e.g., a combined LCD and capacitive overlay) is more likely to classify under Chapter 85 as a display unit or under the relevant instrument heading if presented as part of a complete instrument assembly. The absence of display function is the critical distinguishing criterion for the 9033003000 line.