US PATENT SUBCLASS 122 / 421
.~ Offtake flue

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

412  DF  FEED HEATERS {17}
421.~ Offtake flue

DEFINITION

Classification: 122/421

(under subclass 420) Feed water heaters not of general application in other arts for heat transference, located in the waste heat flue or "offtake" flue of the boiler, between the boiler and smokestack.