US PATENT SUBCLASS 122 / 477
.~.~ Superheater and feed heater

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

459  DF  STEAM TREATMENT {7}
*  DD  .~ Water tube boiler {7}
477.~.~ Superheater and feed heater

DEFINITION

Classification: 122/477

(under subclass 459) Subject matter comprising water tube boilers provided with both a superheater for steam and a feed water heater.