US PATENT SUBCLASS 122 / *
.~.~.~ Double

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}
58 R  DF  .~.~ Drop water firebox {11}
*.~.~.~ Double {1}
60  DF  .~.~.~.~> Alternate smoke return