| 75 / | HD | SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES |
| 330 | DF | PROCESSES {9} |
| 392 | DF | .~ Producing or treating free metal {10} |
| 414 | DF | .~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7} |
| 585 | DF | .~.~.~ Nonferrous {25} |
| 654 | DF | .~.~.~.~ Zinc(Zn) {3} |
| 656 | DF | .~.~.~.~.~ Reduction {2} |
| 658 | DF | .~.~.~.~.~.~ Vaporizing or condensing {4} |
| 661 | | .~.~.~.~.~.~.~ Treating material in vertical retort |