US PATENT SUBCLASS 219 / 491
.~.~.~ Combined (e.g., electromechanical and thermal)

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
482  DF  .~ With power supply and voltage or current regulation or current control means {4}
490  DF  .~.~ Automatic regulating or control means {11}
491.~.~.~ Combined (e.g., electromechanical and thermal)

DEFINITION

Classification: 219/491

(under subclass 490) Subject matter wherein the automatic control structure includes at least two or more means each of which operates independently and on a different principle. An example of the devices to be found in this subclass comprises mechanical timing means and thermally responsive thermostatic means.

SEE OR SEARCH CLASS

99, Foods and Beverages: Apparatus,

328, and 333 for automatic control of heating and cooking apparatus by time and heat responsive means.

323, Electricity: Power Supply or Regulation Systems.

338, Electrical Resistors,

14, for resistors in general responsive to plural conditions.