US PATENT SUBCLASS 122 / *
.~.~ Plural upper longitudinal 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}
*.~.~ Plural upper longitudinal drum {1}
351  DF  .~.~.~> Plural lower longitudinal drum