Medical and dental instruments and apparatus, namely, dental handpieces, [ dental drills, dental scalers, dental burrs, dental picks, dental surgical instruments, dental X-ray appliances, ] dental mirrors [ parts of all of the above instruments and appliances; dental prophylactic instruments, namely, dental picks, dental scalers; special furniture for medical use, particularly for oral prophylactics, namely, dental chairs, dentists' chairs; treatment units for oral prophylactics comprising a ...