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 | .~.~ Al-base component {3} | |
651 | DF | .~.~.~> Next to refractory (Group IVB, VB, or VIB) metal-base component |
652 | DF | .~.~.~> Next to Group VIII or IB metal-base component {1} |
654 | DF | .~.~.~> Next to Al-base component |