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

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}
*  DD  .~.~ Standpipe {1}
*.~.~.~ Water tube {3}
184  DF  .~.~.~.~> Annular firebox
185  DF  .~.~.~.~> Loop
186  DF  .~.~.~.~> Spur