266 / | HD | METALLURGICAL APPARATUS |
78 | DF | WITH CONTROL MEANS RESPONSIVE TO SENSED CONDITION {6} |
90 | DF | .~ With means responsive to condition of treated material {2} |
92 | DF | .~.~ By means sensing position of work {2} |
94 | .~.~.~ By means sensing level of molten liquid {1} | |
95 | DF | .~.~.~.~> By float means |