| 48 / | HD | GAS: HEATING AND ILLUMINATING |
| 197 R | DF | PROCESSES {15} |
| 198.1 | DF | .~ Manufacture from methane (natural gas) {6} |
| 198.8 | ![]() | .~.~ With specified reactant velocity, angle of entry to reactor or mechanical energy production, e.g., use of internal combustion engine, etc. |