373 / | HD | INDUSTRIAL ELECTRIC HEATING FURNACES |
109 | DF | RESISTANCE FURNACE DEVICE {7} |
117 | DF | .~ With heating element detail {7} |
120 | DF | .~.~ Open circuit (e.g., charge internal resistance heating) {4} |
125 | .~.~.~ Including terminal detail {1} | |
126 | DF | .~.~.~.~> With axial bore |