(under subclass 47) Subject matter in which a selector switch is operated in such a manner as to introduce into a selector circuit an independent set of frequency determining parameters consisting of a tuned transformer circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
61+, for tuners having mutual inductance variable means which may be a tuned transformer circuit.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems, appropriate subclasses, especially
83, for plural transformer systems in general. 323, Electricity: Power Supply or Regulation Systems,
247, 301, 305, and 328 for transformer systems in voltage magnitude control systems.
154, for cascaded amplifiers with different coupling between the stages, one of which is a transformer, and subclasses 165+ for transformers used as interstage coupling between amplifier stages.
333, Wave Transmission Lines and Networks,
177+, for wave transmission transformer coupled circuits of the passive type, generally.
336, Inductor Devices, appropriate subclass for transformer structure.
361, Electricity: Electrical Systems and Devices,
268+, for transformers with integral switch, condenser or lock means.