(under the class definition) Subject matter in which a reactance element or elements of a tuned circuit is wound on a core and is adapted to be unwound therefrom, as on a second core, to change the reactance values of the tuned circuit.
(1) Note. Examples of subject matter classified here include an inductor whose element is wound from an insulating core to a conducting core, the conducting core short-circuiting the portion of the inductor element wound thereon; or a capacitor which is varied by winding or unwinding one plate of the capacitor over a second insulated plate shaped in the form of a cylinder or core.
SEE OR SEARCH CLASS
191, Electricity: Transmission to Vehicles,
12.2+, for an electric current supply conductor and reel means upon which the conductor may be wound.
242, Winding, Tensioning, or Guiding, appropriate subclasses for winding, tensioning, or guiding in general use. 336, Inductor Devices,
15, for variable inductors whose effective length is changed by winding or unwinding the conductor forming the inductor.
338, Electrical Resistors,
79, for mechanically variable resistors which are varied by winding or unwinding the resistance element from a core or form.
343, Communications: Radio Wave Antennas,
877, for antennae having a reel upon which the antenna may be wound.