US PATENT SUBCLASS 122 / 212.2
.~.~ With return or alternate flue

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

209.1  DF  SECTIONAL {9}
212.1  DF  .~ With magazine {1}
212.2.~.~ With return or alternate flue

DEFINITION

Classification: 122/212.2

With return or alternate flue:

(under subclass 212.1) Devices wherein a substitute or return flue is provided to preheat air for combustion.