US PATENT SUBCLASS 110 / 188
.~.~ Of noncombustible fluid; e.g., air, etc.

Current as of: June, 1999
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110 /   HD   FURNACES

185  DF  WITH CONTROL MEANS RESPONSIVE TO A SENSED CONDITION {1}
186  DF  .~ Feed control {2}
188.~.~ Of noncombustible fluid; e.g., air, etc. {2}
189  DF  .~.~.~> Pressure sensor
190  DF  .~.~.~> Temperature sensor

DEFINITION

Classification: 110/188

Of noncombustible fluid; e.g., air, etc:

(under subclass 186) Apparatus wherein the constituent being supplied is air, steam, or water.

SEE OR SEARCH THIS CLASS, SUBCLASS:

297+, for furnace structure provided with fluid supply means.