Explanatory notes
… the machinery of headings 84.25 to 84.30. It should also be noted that many parts do not fall in this heading since … guides, stop‑collars, spider bowls, split bushing slips, beams, swivel sockets, and drilling jars, for well drilling … The heading also excludes : (a) Transmission or conveyor belts or belting, of plastics ( Chapter 39 ), of vulcanised …