(under subclass 74) Subject matter wherein the output coupling network includes a device having at least two spaced electrodes between which an electric current may be caused to flow. Included, by way of example, are spark gaps, electron tubes (diodes, triodes, etc.) of the vacuum type or gas-filled type and solid state equivalents thereof, such as semi-conductor barrier layer devices (e.g., rectifier, transistors).
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46+, for plural oscillator systems wherein one oscillator may be in the output circuit of another oscillator.
72, for electron coupled oscillators wherein a single multi-grid electron tube (e.g., tetrode or pentode) is so connected that one section of the tube acts as an oscillator and the output electrode (usually the anode) is coupled to the oscillator solely through the electron stream and acts effectively as a stage of amplification.
150, for relaxation oscillators with output circuit connected to another discharge device circuit.
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307, Electrical Transmission Interconnection Systems, 401+, for miscellaneous systems utilizing nonlinear reactor devices and not elsewhere classifiable and subclasses 106+ for class appropriate waveform or wave shape determinative or pulse producing systems.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous transistor and electron tube nonlinear circuits.
330, Amplifiers, appropriate subclasses for the various types of linear amplifiers, per se.
