(under the class definition) Subject matter wherein the amplifying device, to which the electric input signal is applied to control the power supply source of electric energy also applied thereto, is a resistive means, which may be liquid, solid, or of granular construction.
(1) Note. Not included herein, are other devices having resistive properties such as gas tubes, vacuum tubes, etc..
(2) Note. Variable resistors, although including a sensing means and/or power supply means, as structure are classified in Class 338, Electrical Resistors. Where such subject matter involves a load circuit, classification is herein, when the signal output is "substantially a replica of the signal input"; otherwise classification is in the appropriate subclass of Class 323, Electricity: Power Supply or Regulation Systems.
SEE OR SEARCH THIS CLASS, SUBCLASS:
250+, for amplifiers with semiconductor type amplifying devices. See the notes and search notes thereunder.
SEE OR SEARCH CLASS 323, Electricity: Power Supply or Regulation Systems.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for systems utilizing variable resistance devices of the nonlinear conductor type and which systems are not elsewhere classifiable.
338, Electrical Resistors, appropriate subclasses for the structure of resistors, per se, especially
