Explanatory notes
… depending on their use, are generally used in tanks, vats, etc., for heating liquids, semi-fluid (other than solid) … to be used in pots, pans, tumblers, cups, baths, beakers, etc., usually with a heat-insulated handle and a hook for … infra‑red radiation for heating public places, streets, etc. (6) Heating units for motor cars, railway coaches, …