Explanatory notes
… apparatus (including apparatus for functional exploratory examination or for checking physiological parameters) : … medicine or surgery (human or veterinary) are, in effect, tools (e.g., hammers, mallets, saws, chisels, gouges, … needle holders) . (12) Retractors (lip, jaw, abdominal, tonsil, liver, etc.). (13) Dilators (laryngeal, urethral, …