US PATENT SUBCLASS 137 / 336
.~.~ Flue extending through fluid

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

334  DF  WITH HEATING OR COOLING OF THE SYSTEM {6}
335  DF  .~ With burner {1}
336.~.~ Flue extending through fluid

DEFINITION

Classification: 137/336

(under subclass 335) Apparatus in which an enclosed

passageway for gases and flames from the burner extends through the fluid.