US PATENT SUBCLASS 261 / 141
.~ Heat producer

Current as of: June, 1999
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261 /   HD   GAS AND LIQUID CONTACT APPARATUS

127  DF  WITH EXTERNAL SUPPLY OR REMOVAL OF HEAT {14}
141.~ Heat producer {2}
142  DF  .~.~> Electric heater
143  DF  .~.~> Means burning contact product {1}

DEFINITION

Classification: 261/141

(under subclass 127) Apparatus including a device by which the external heat is produced by transformation of energy.

SEE OR SEARCH CLASS

48, Gas: Heating and Illuminating,

107, for a heated oil retort into which air is injected.