Acoustic couplers; Choking coils for use in electrical apparatus; Commutators; Connections for electric lines; Control system for the remote observation, management and operation of cranes, comprising computers, software, electromechanical controls, and video display screens; Current rectifiers; Digital switching systems comprised of interconnected electromechanical and solid-state power management enclosures with standard and custom keypads for user remote control, the foregoing for use on marine helms and land-based vehicle dashboards; Dynamometers; Electric buzzers; Electric capacitors; Electric coils; Electric connections; Electric couplings; Electric installations for the remote control of industrial operations; Electric junction boxes; Electric meters; Electric switch plates; Electric switches; Electric transformers; Electrical distribution boxes; Electrical distribution systems, namely, power distribution panels; Electrical inductors; Electrical plugs and sockets; Electrical terminal blocks; Electricity conduits; Electricity distribution consoles; Electricity limiters; Electromagnetic coils; Electronic apparatus for the remote control of industrial operations; Holders for electric coils; Junction sleeves for electric cables; Lightning arresters; Lightning conductors; Lightning rods; Measuring apparatus, namely, clamp meters for measuring electricity; Parts for anti-theft automotive alarms, namely, electronic sensors, remote control transmitters and receivers for remotely operating land vehicles; Rheostats; Scientific measuring instruments, namely, conductivity meters; Solenoid valves; electromagnetic switches; Step up transformers; Switch boxes; Technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity and concentration of gas and liquids; Tape measures; Telegraph wires; Testing and measuring equipment for use in testing the performance and efficiency of power plant equipment