37 Maintenance and repair services for machine tool, engines other than for land vehicles, non-electrical couplings and transmission assemblies other than for land vehicles, electric agricultural instruments, egg incubators, crankcases for engines, clack valves, engine controlling devices, electric motors, hydraulic engines for machines, piston segments, bearings for transmission shafts, machines pumps, speed governors for machines, engines and motors, valves as parts of machines; maintenance and repair services for scientific, nautical, survey, photographic, cinematographic, optical, weighing, measuring, signalling, inspection, rescue and teaching apparatus and instruments, apparatus for recording, transmission or reproduction of sound or images, magnetic recording media, recording discs, automatic vending machines and mechanisms for coin-operated apparatus, cash registers, calculating machines, equipment for data-processing and computers, fire extinguishers, electric control panels instruments for measurement and signalling; maintenance and repair services for apparatus for lighting, heating, steam generation, cooking, refrigeration, drying, ventilation, water supply and sanitation installations, installations for water or gas distribution, cleaning and purification