| 266 / | HD | METALLURGICAL APPARATUS |
| 168 | DF | MEANS FOR TREATING ORES OR FOR EXTRACTING METALS {3} |
| 171 | DF | .~ By means applying heat to work, e.g., furnace {10} |
| 190 | DF | .~.~ With cooling of heating means {3} |
| 193 | DF | .~.~.~ By means embedded in heating means {1} |
| 194 | | .~.~.~.~ Having means to facilitate removal of cooling means |