US PATENT SUBCLASS 122 / *
.~ Horizontal fire tube boiler

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

412  DF  FEED HEATERS {17}
*.~ Horizontal fire tube boiler {2}
423  DF  .~.~> Smoke box {3}
427  DF  .~.~> Smoke chamber