US PATENT SUBCLASS 122 / 16
.~.~ Fluid fuel

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

13.1  DF  STAND BOILER {6}
*  DD  .~ Fire tube and water tube {1}
16.~.~ Fluid fuel

DEFINITION

Classification: 122/16

(under subclass 13) Stand boilers provided with both fire tubes and water tubes adapted to be heated by a fluid fuel burner.

SEE OR SEARCH THIS CLASS, SUBCLASS:

15, for steam boilers provided with fire tubes and water tubes heated by a solid fuel furnace.

17, for stand boilers provided only with fire tubes and heated by fluid fuel.