| 264 / | HD | PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES |
| 500 | DF | DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO PERMANENTLY SHAPE, DISTORT, OR SUSTAIN WORK {14} |
| 523 | DF | .~ Including application of internal fluid pressure to hollow finite length parison to expand same into conformity with female mold part {10} |
| 540 | | .~.~ Including extrusion {2} |
| 541 | DF | .~.~.~> Of irregular or varying cross section |
| 542 | DF | .~.~.~> With movement of parison or workpiece from one work station to another {1} |