US PATENT SUBCLASS 122 / 465
.~.~.~.~.~ Steam tube

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

459  DF  STEAM TREATMENT {7}
*  DD  .~ Fire tube boiler {3}
*  DD  .~.~ Horizontal {1}
461  DF  .~.~.~ Superheater {3}
*  DD  .~.~.~.~ Smoke box {2}
465.~.~.~.~.~ Steam tube

DEFINITION

Classification: 122/465

(under subclass 461) Devices relating to the structure and arrangement of a steam tube superheater at the smokebox end of a horizontal fire tube boiler and generally located in the smokebox.