335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclass 45 for electromagnetic tripping means having regulating, adjusting or calibrating means.
(Electricity: Magnetically Operated Switches, Magnets, and Electromagnets; subclass; 45 for electromagnetic tripping means having regulating, adjusting or calibrating means)
Electricity: Magnetically Operated Switches, Magnets, and Electromagnets
subclass
45 for electromagnetic tripping means having regulating, adjusting or calibrating means