US PATENT SUBCLASS 122 / *
.~.~ Annular lower drum

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

235.11  DF  WATER TUBE {52}
332  DF  .~ Vertical {10}
*.~.~ Annular lower drum {4}
338  DF  .~.~.~> Annular upper drum {2}
341  DF  .~.~.~> Fire tube upper drum
342  DF  .~.~.~> Spur tube upper drum
343  DF  .~.~.~> Upper drum {1}