US PATENT SUBCLASS 122 / 446
.~.~ Fluid fuel

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

*  DD  REGULATION {2}
*  DD  .~ Fuel and water {2}
446.~.~ Fluid fuel {1}
447  DF  .~.~.~> Cutoff

DEFINITION

Classification: 122/446

(under the class definition) Devices for feeding both fluid fuel to the burner and water to the boiler that are not automatically regulated.