US PATENT SUBCLASS 122 / 167
.~.~.~ Fluid fuel

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

135.1  DF  FLUE {4}
155.1  DF  .~ Vertical {16}
166.1  DF  .~.~ With internal water tube {12}
167.~.~.~ Fluid fuel

DEFINITION

Classification: 122/167

(under subclass 166) Devices heated by fluid fuel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

161, 177, 179, and 183, for other types of vertical flue boilers heated by fluid fuel.