| 528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
| * | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
| 373 | DF | .~ FROM SULFUR-CONTAINING REACTANT {5} |
| 381 | DF | .~.~ From inorganic sulfur-containing reactant {4} |
| 382 | | .~.~.~ Sulfur dioxide is a reactant {2} |
| 383 | DF | .~.~.~.~> Polymerizing in the presence of a specified material other than a reactant {2} |
| 386 | DF | .~.~.~.~> With reactant containing only hydrogen and carbon atoms |