335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclass 281 for the particular structure of the core or pole shape or structure or material of the electromagnetic device.
(Electricity: Magnetically Operated Switches, Magnets, and Electromagnets; subclass; 281; for the particular structure of the core or pole shape or structure or material of the electromagnetic device)
Electricity: Magnetically Operated Switches, Magnets, and Electromagnets
subclass
281 for the particular structure of the core or pole shape or structure or material of the electromagnetic device