US PATENT SUBCLASS 122 / 506
.~.~ Pressure-controlled

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

504  DF  SAFETY DEVICES {4}
504.3  DF  .~ Fire extinguishers {3}
506.~.~ Pressure-controlled

DEFINITION

Classification: 122/506

(under subclass 504) Subject matter relating to devices for extinguishing or dampening the fire of the boiler when a certain pressure inside the boiler is attained. This includes combined safety valves and fire extinguishers.