Electrical switching and control devices, namely, electrical ignition and flame monitoring devices, heat, time and temperature controllers for electrical welding processes, melting, inertization, purging, water treatment, generation of controlled atmospheres in ovens or furnaces, and for oxyfuel cutting, welding, brazing, heating and metal spraying; checking, alarm and controlling devices for gas supply systems, namely, electronic valves for controlling gas supply, gas alarms, gas testing ins...