US PATENT SUBCLASS 218 / 42
.~.~ Within vacuum

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}
22  DF  .~ Magnetic blowout {7}
42.~.~ Within vacuum

DEFINITION

Classification: 218/42

Within vacuum:

(under subclass 22) Subject matter wherein the switch whose contacts are enclosed in an evacuated bulb.

SEE OR SEARCH THIS CLASS, SUBCLASS:

118+, for vacuum switch in general arc preventing devices.