US PATENT SUBCLASS 219 / 500
.~.~.~ Including electron or glow-discharge tube means

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}
500.~.~.~ Including electron or glow-discharge tube means

DEFINITION

Classification: 219/500

(under subclass 490) Subject matter wherein the condition responsive regulation means claimed includes electron or glow discharge tube means.

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501, for condition responsive regulators utilizing semiconductor means (e.g., transistors).

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315, Electric Lamp and Discharge Devices: Systems,

149+, for gaseous space discharge devices responsive to or controlled by radiant energy.

323, Electricity: Power Supply or Regulation Systems, 291, for automatic voltage control systems with electric space discharge devices.

361, Electricity: Electrical Systems and Devices,

139+, for control circuits for electromagnets and relays including tube means.