US PATENT SUBCLASS 122 / 161
.~.~.~ 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}
160  DF  .~.~ Concentric shell {2}
161.~.~.~ Fluid fuel

DEFINITION

Classification: 122/161

(under subclass 160) Devices heated by fluid fuel.

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183, for spiral water conduits.