Installation, maintenance, repair and refurbishment of power generating equipment and energy plants; installation and maintenance of motors and engines not for land vehicles, electricity generators, compressors, valves, oil coolers for engines, silencers for motors and engines, vibration meters, power generating steam engine boilers, hydraulic and pneumatic controls, electric control panels, electronic control systems for machines and engines, electronic monitors and monitor modules for motors and engines, gas detectors, and electronic analyzers for measuring, testing and detecting fuel emissions; providing information and advice and consulting in connection with the foregoing