219 / | HD | ELECTRIC HEATING |
50 | DF | METAL HEATING (E.G., RESISTANCE HEATING) {19} |
72 | DF | .~ Nonatmospheric environment at hot spot (e.g., resistance weld under oil, vacuum) {2} |
73 | DF | .~.~ Slag (e.g., submerged arc) {2} |
73.1 | DF | .~.~.~ Including electroslag welding {1} |
73.11 | .~.~.~.~ For coating |