(under subclass 71) Subject matter wherein a movable contact is adjustable along the length of the inductor element to thereby vary the effective inductance of the inductor and thus tune the circuit over a range or band of frequency.
(1) Note. The contact does not necessarily have to make physical contact with the inductance winding but may be capacitively coupled thereto. If capacitor type contacts are present classification is indented subclass 73 below.
(2) Note. When the contact is stationary and the inductor element movable, classification is not in this subclass but in subclass 71 above.
SEE OR SEARCH CLASS
336, Inductor Devices,
139+, for variable inductor devices having a contact which follows a helical conductor, and subclass 149 for inductors having a contact slidable on the coil winding. 338, Electrical Resistors,
118+, for a variable resistor having a contact which moves along the length of a resistance element.
