Apparatus, instruments and cables for electricity, namely, cables for the transmission of electricity; Information technology and audio-visual, multimedia and photographic devices, namely, cameras for monitoring and inspecting environments for the presence of gas leaks and partial discharges of electricity; Measuring, detecting, monitoring and controlling devices, namely, cameras used to detect gas leaks and partial discharges of electricity; Navigation, guidance, tracking, targeting and map making devices, namely, electronic devices for detecting and locating gas leaks and partial discharges of electricity using ultrasonic sensors; Optical devices, enhancers and correctors, namely, cameras; Safety, security, protection and signalling devices, namely, gas alarms; Scientific and laboratory devices for treatment using electricity, namely, acoustic cameras in the nature of electronic ultrasound inspection devices for non-destructive testing, not for medical purposes