528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
* | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
271 | DF | .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10} |
272 | DF | .~.~ From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof {15} |
306 | .~.~.~ Ethylenically unsaturated carboxylic acid or derivative of an ethylenically unsaturated carboxylic acid |