Explanatory notes
… 39.11 ‑ Petroleum resins, coumarone-indene resins, … not elsewhere specified or included, in primary forms. 3911.10 ‑ Petroleum resins, coumarone, indene or coumarone‑indene resins and polyterpenes 3911.20 ‑ Poly (1,3-phenylene methylphosphonate) 3911.90 ‑ …