| 428 / | HD | STOCK MATERIAL OR MISCELLANEOUS ARTICLES |
| 98 | DF | STRUCTURALLY DEFINED WEB OR SHEET (E.G., OVERALL DIMENSION, ETC.) {20} |
| 174 | DF | .~ Nonplanar uniform thickness material {5} |
| 179 | DF | .~.~ Aligned or parallel nonplanarities {3} |
| 182 | DF | .~.~.~ Parallel corrugations {2} |
| 184 | DF | .~.~.~.~ Plural corrugated components {2} |
| 186 | ![]() | .~.~.~.~.~ With planar component |