Winding machines for electrical purposes including machines for winding coils, inductances and resistors, medium and heavy duty winding machines for round and flat wires, and machines for winding armatures; Universal rotor treating lathes, machines for insulating coils including coil taping machines, wire ring wrapping machines, wire taping machines, machines for the manufacture of commutators including machines for milliling mica between commutator blakes, machines for insulating wires, mica covering machines, rotor and stator coil presses, grinding machines, vacuum pumps including rotary and diffusion types, vacuum impregnation apparatus

Capacitors of all types, high voltage test and research apparatus including surge generators, high-voltage direct current equipment, mechanical rectifiers, voltage dividers, sphere gaps, oil testing equipment, and high-voltage indicators, transformer protecting devices including flow indicators and trafoscopes,oil regeneration plants for insulating oil being parts of electrical transformer apparatus and condensers; complete insulators for alternators, motors, transformers, switches and medium and high frequency apparatus, insulator bushings, and pin-type insulators for indoor use all being in the nature of coil or core-formers; laboratory equipment. Electric insulating mouldings, electric insulating materials including tubes, cylinders, rods and machined components being in the nature of manufactured articles

Electric insulating materials, not being composed principally of resin or vegetable oil, being sheets, paper laminated plastic, fabric laminated plastic and plywood, laminated plastic insulating materials,oil-impregnated tapes and sheets of silk, cotton and glass fibre, and mica insulating products, all being goods not included in other classes,