.~> Predetermined center frequency selector (e.g., push-button control)
(under the class definition) Subject matter in which the tuned circuit consists of at least one variable reactance tuning unit which is adapted to have its reactance adjusted so as to vary the resonance of the tuner, the adjustable reactance tuning unit being driven by an electromagnetic operator which is mechanically connected to the variable tuning unit.
(1) Note. The reactance tuning may be driven directly or indirectly by the electromagnetic operator. An example of an indirectly driven reactance tuning unit is where the electromagnetic operator is energized periodically and during these periods loads or winds an energy storage device such as a spring so that during the period when the electromagnetic operator is not energized, the energy storage device will furnish power to drive the variable reactance tuning unit.
(2) Note. To be properly classified in this subclass significant details of the tuner must be disclosed and claimed. The mere recitation of a tuner broadly with details to the electromagnetic operator or control system for the operator will be classified with the operator or system.
(3) Note. Switch type tuners are considered as variable reactance tuning units for classification in this and indented subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9+, for electromagnetic operated tuners which are remotely controlled. SEE OR SEARCH CLASS
310, Electrical Generator or Motor Structure, appropriate subclasses for electrical generator or motor structure, per se.
318, Electricity: Motive Power Systems, appropriate subclasses for electromagnetic operators with control systems, per se.