US PATENT SUBCLASS 110 / 307
.~.~.~.~ Below grate

Current as of: June, 1999
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110 /   HD   FURNACES

297  DF  INCLUDING NONCOMBUSTIBLE FLUID SUPPLY MEANS {3}
301  DF  .~ Having treatment means {2}
302  DF  .~.~ Preheater {5}
306  DF  .~.~.~ Water or steam {1}
307.~.~.~.~ Below grate

DEFINITION

Classification: 110/307

Below grate:

(under subclass 306) Apparatus wherein the water or steam is fed below the fuel supporting means.