335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclasses 229+ for devices with electromagnets combined with permanent magnets having an armature.
(Electricity: Magnetically Operated Switches, Magnets, and Electromagnets; subclasses; 229+ for devices; with electromagnets) (electromagnets; combined; with permanent magnets) (permanent magnets; having; an armature)
Electricity: Magnetically Operated Switches, Magnets, and Electromagnets electromagnets permanent magnets
subclasses combined having
229+ for devices with electromagnets
with permanent magnets
an armature