| 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 |  | .~.~ Automatic regulating or control means {11} |
| 491 | DF | .~.~.~> Combined (e.g., electromechanical and thermal) |
| 492 | DF | .~.~.~> Comprising timing or cycling means {1} |
| 494 | DF | .~.~.~> Thermally responsive {1} |
| 496 | DF | .~.~.~> Pressure responsive |
| 497 | DF | .~.~.~> Comprising voltage and/or current measuring and comparing or combining means {2} |
| 500 | DF | .~.~.~> Including electron or glow-discharge tube means |
| 501 | DF | .~.~.~> Including semiconductor means (e.g., transistor) |
| 502 | DF | .~.~.~> Utilizing light-sensitive and/or responsive means |
| 503 | DF | .~.~.~> Inductive reactor means (e.g., auto transformer) |
| 504 | DF | .~.~.~> Comprising variable resistance means {1} |
| 506 | DF | .~.~.~> With signal or indicating means |