US PATENT SUBCLASS 122 / *
.~.~ Two diameters

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

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
*.~.~ Two diameters {2}
84  DF  .~.~.~> Great diameter over firebox
85  DF  .~.~.~> Small diameter over firebox {1}