| 528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
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| * | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
| 403 | DF | .~ FROM HETEROCYCLIC REACTANT CONTAINING AS RING ATOMS OXYGEN, SELENIUM OR TELLURIUM, E.G., EPOXY, ETC. {7} |
| 408 | DF | .~.~ Polymerizing in the presence of a specified material other than a reactant {1} |
| 409 |  | .~.~.~ Material contains a metal atom {4} |
| 410 | DF | .~.~.~.~> Material contains a transition metal atom {2} |
| 413 | DF | .~.~.~.~> Material contains a Group IIA metal atom (Be, Mg, Ca, Sr, Ba, Ra) |
| 414 | DF | .~.~.~.~> Material contains a Group IIB metal atom (Zn, Cd, Hg) {1} |
| 416 | DF | .~.~.~.~> Material contains a Group IIIA metal atom (Al, Ga, In, Tl) |