US PATENT SUBCLASS 122 / *
.~.~.~ Internal water tube

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

459  DF  STEAM TREATMENT {7}
*  DD  .~ Flue boiler {1}
*  DD  .~.~ Vertical {1}
*.~.~.~ Internal water tube {1}
468  DF  .~.~.~.~> Superheater