US PATENT SUBCLASS 218 / 59
.~.~.~ With gas blast means

Current as of: June, 1999
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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.~.~.~ With gas blast means {2}
60  DF  .~.~.~.~> Piston structure
61  DF  .~.~.~.~> Compressing cylinder structure {1}

DEFINITION

Classification: 218/59

With gas blast means:

(under subclass 57) Subject matter including details of means which compress air to a certain pressure.