US PATENT SUBCLASS 122 / *
.~.~ Spiral water conduit

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}
*.~.~ Spiral water conduit {1}
183  DF  .~.~.~> Fluid fuel