Classification in 8479 is residual: a machine belongs here only if no other heading in the chapter more specifically describes it. The analysis starts with the machine's principal function and works through the chapter's specific headings before landing on 8479. CBP binding rulings are particularly useful for novel equipment that lacks a clear precedent.

847950 covers industrial robots designed for multiple uses. A robot configured and sold exclusively for a specific function already covered by another heading — for example, a welding robot that is essentially a welding machine — may instead classify under that more specific heading. The 'multiple uses' criterion in 847950 is key: a robot marketed and designed for a single dedicated industrial process may not qualify.