| 264 / | HD | PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES |
| 165 | DF | FORMING CONTINUOUS OR INDEFINITE LENGTH WORK {8} |
| 176.1 | DF | .~ Shaping by extrusion {11} |
| 177.1 | DF | .~.~ To produce particular cross section (e.g., noncircular, etc.) {6} |
| 177.17 | DF | .~.~.~ Processing or treatment after extrusion (e.g., support, guide, etc.) {2} |
| 177.18 | | .~.~.~.~ Chemical |