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

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

44.1  DF  FIRE TUBE {11}
*  DD  .~ Horizontal or inclined {1}
*.~.~ Water firebox {1}
50  DF  .~.~.~> Flue