Voltage surge protectors, fuses, circuit breakers, distribution boxes for electrical power, switchboards, solenoid valves, electric switches, lightning conductors, lightning counters, ammeters, galvanometer, dynamometers; electric measuring devices, namely, dielectric constant and dielectric loss testers; frequency meters, electric meters, fire alarms, electrical-fire detectors, guide rail miniature electric energy meters, voltmeters, oscillography apparatus, namely, oscillographs; electrical...