335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclass 76 for electromagnetically operated switches with spring motor means.
(Electricity: Magnetically Operated Switches, Magnets, and Electromagnets; subclass; 76; for electromagnetically operated switches with spring motor means)
Electricity: Magnetically Operated Switches, Magnets, and Electromagnets
subclass
76 for electromagnetically operated switches with spring motor means