US PATENT SUBCLASS 122 / *
.~ Fire tube boiler

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

459  DF  STEAM TREATMENT {7}
*.~ Fire tube boiler {3}
*  DD  .~.~> Horizontal {1}
466  DF  .~.~> Superheater and feed heater
*  DD  .~.~> Vertical {1}