US PATENT SUBCLASS 122 / 348
.~.~.~ Fluid fuel

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

235.11  DF  WATER TUBE {52}
332  DF  .~ Vertical {10}
*  DD  .~.~ Internal fire tube {1}
348.~.~.~ Fluid fuel

DEFINITION

Classification: 122/348

(under subclass 332) Devices in which the vertical water tubes are provided with internal fire tubes and heated by fluid fuel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

174, for vertical flue boilers having vertical water tubes provided with internal fire tubes.

243, and 271, for vertical water tube boilers provided with internal fire tubes and heated by solid fuel.