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} |
655 | DF | .~.~ Transition metal-base component {4} |
668 | DF | .~.~.~ Group VIII or IB metal-base component {10} |
670 | .~.~.~.~ Platinum group metal-base component |