US PATENT SUBCLASS 122 / 502
.~ Fluid fuel

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

501  DF  FLUID-DISPLACER {1}
502.~ Fluid fuel

DEFINITION

Classification: 122/502

(under subclass 501) Subject matter wherein the boiler is heated by fluid fuel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

243, and 406, for related art.