US PATENT SUBCLASS 122 / *
.~.~ Single upper drum

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

235.11  DF  WATER TUBE {52}
324  DF  .~ Straddle {2}
*.~.~ Single upper drum {1}
327  DF  .~.~.~> Plural lower drum {3}