| 219 / | HD | ELECTRIC HEATING |
| 50 | DF | METAL HEATING (E.G., RESISTANCE HEATING) {19} |
| 78.01 | DF | .~ For bonding with pressure (e.g., resistance welding) {16} |
| 108 | DF | .~.~ Systems of current supply {7} |
| 110 | ![]() | .~.~.~ Controlled in response to current, voltage, or temperature |