| 428 / | HD | STOCK MATERIAL OR MISCELLANEOUS ARTICLES |
| 544 | DF | ALL METAL OR WITH ADJACENT METALS {31} |
| 615 | DF | .~ Composite; i.e., plural, adjacent, spatially distinct metal components (e.g., layers, joint, etc.) {15} |
| 650 | DF | .~.~ Al-base component {3} |
| 652 | ![]() | .~.~.~ Next to Group VIII or IB metal-base component {1} |
| 653 | DF | .~.~.~.~> Fe |