(under subclass 47) Subject matter in which the element or elements substituted by the switching operation consists of a plurality of inductors.
(1) Note. Subject matter usually found in this subclass consists of a capacitor element which is mechanically fixed in the tuned circuit and is connected to a switch which substitutes various inductors into or out of the circuit to thus vary the resonant frequency of the tuner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7, for push button and/or lever operated tuners which may be of the type which substitutes one inductor for another within the tuned circuit.
71+, for tuner units which are tuned by a continuous variable inductor.
SEE OR SEARCH CLASS
336, Inductor Devices,
137+, for inductors having means to change the length or connections of the inductor. See Search Notes under subclass 137 for additional fields of search as to variable inductance devices.
