US PATENT SUBCLASS 169 / 12
.~.~ Combustion products

Current as of: June, 1999
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169 /   HD   FIRE EXTINGUISHERS

5  DF  FLUID SYSTEMS {7}
11  DF  .~ Gas {1}
12.~.~ Combustion products

DEFINITION

Classification: 169/12

(under subclass 11) The extinguishing agent consisting of flue or furnace gases or like products of combustion and is forced into the fire area usually after being cooled and purified.