US PATENT SUBCLASS 122 / 182.3
.~.~.~ Having tubes offset from firebox

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}
182.1  DF  .~.~ With return fire tube {2}
182.3.~.~.~ Having tubes offset from firebox

DEFINITION

Classification: 122/182.3

(under subclass 182.1) Having tubes offset from firebox: Devices wherein the fire tubes are not directly in line with the combustion chamber.