Explanatory notes
… drive bushings, tool‑joints, drill collars, subs, drill pipe guides, stop‑collars, spider bowls, split bushing … for multi‑bucket excavators; jibs for mechanical shovels; pile‑driver hammers. (6) Track‑laying or wheeled chassis, … and rods ( heading 72.28 ). (d) Casing, tubing and drill pipes ( headings 73.04 to 73.06 ). (e) Adjustable or …