218 / | HD | HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES |
1 | DF | ARC PREVENTING OR EXTINGUISHING DEVICES {14} |
43 | DF | .~ Air-current blowout {18} |
57 | DF | .~.~ Puffer piston {6} |
59 | DF | .~.~.~ With gas blast means {2} |
60 | .~.~.~.~ Piston structure |