US PATENT SUBCLASS 122 / 176
.~.~.~ Transverse

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}
176.~.~.~ Transverse {1}
177  DF  .~.~.~.~> Fluid fuel

DEFINITION

Classification: 122/176

(under subclass 166) Devices in which the water tubes extend transversely across the flue and communicating at both ends with the boiler.