US PATENT SUBCLASS 122 / *
.~.~.~ Water grate

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}
90  DF  .~.~ Water firebox {8}
*.~.~.~ Water grate {2}
97  DF  .~.~.~.~> Downdraft
98  DF  .~.~.~.~> Updraft