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 |