US PATENT SUBCLASS 334 / 56
.~ Inductor only modified or substituted by switching


Current as of: June, 1999
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334 /   HD   TUNERS

47  DF  WITH SWITCHING MEANS {8}
56.~ Inductor only modified or substituted by switching {1}
57  DF  .~.~> With vernier tuning means {1}


DEFINITION

Classification: 334/56

(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.