US PATENT SUBCLASS 218 / 56
.~.~ Self extinguishing

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}
56.~.~ Self extinguishing

DEFINITION

Classification: 218/56

Self extinguishing:

(under subclass 43) Subject matter including a material which ignites and burns when exposed to a flame or elevated temperature to extinguish an arc.