| 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} |
| 646 | ![]() | .~.~ Sn-base component {2} |
| 647 | DF | .~.~.~> Next to Group IB metal-base component |
| 648 | DF | .~.~.~> Next to Group VIII metal-base component |