(under subclass 137) Subject matter comprising a coil and a contactor which travels on and across the successive conductor turns of the coil, making direct contact with the coil conductor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138, for inductor devices having a plurality of parallel spaced coils, a movable contractor being provided to contact both coils to include an equivalent portion of both coils in circuit.
139, where the coil is a helical coil or spiral and the contactor follows the conductor so as to make continuous contact with the coil conductor.
150, for inductor devices with a tap changing switch.
