US PATENT SUBCLASS 218 / 88
.~.~ Control of blast valve and contacts

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}
88.~.~ Control of blast valve and contacts

DEFINITION

Classification: 218/88

Control of blast valve and contacts:

(under subclass 43) Subject matter comprising a movable valve member that can be operated from a normally closed position to an open position to create a gas blast.