37 Installation, maintenance, and repair of and consulting services in the field of the installation, maintenance, and repair of horizontally and vertically moveable swivel arm systems in the nature of extension arm systems, motorized arm systems, spring arm systems, tripods, booms, telescopic arm systems for use with cameras, monitors, flat panel display screens, liquid crystal display monitors, television monitors, video monitors, electric luminescent display panels, displays for medical images, plasma display panels, electronic display boards, electronic display screens, namely, for suspending such devices from the ceiling, wall or floor; Installation, maintenance, repair of and consulting services in the field of the installation, maintenance, and repair of horizontally and vertically moveable swivel arm systems in the nature of extension arm systems, motorized arm systems, spring arm systems, tripods, booms, telescopic arm systems for use with medical technical apparatus, namely, for suspending medical technical devices from the ceiling, wall or floor in operating theatres, intensive care units, medical practices, hospital patient rooms, and in the field of diagnosis and therapy; Installation, maintenance repair of and consulting services in the field of the installation, maintenance, and repair of ceiling service units specially adapted for mounting medical apparatus, for feeding electricity to medical apparatus and for supplying signals and/or liquids and/or gases to and transferring signals and/or liquids and/or gases from medical apparatus [ ; Installation, maintenance, repair of and consulting services in the field of the installation, maintenance, and repair of electric hair shearing machines, hair shearing machines for animals, hair cutting scissors, electric and battery operated hair clippers, and trimmer and razors, hair dryers, electric hair curling irons, electric hair crimpers, electric and non electric razors, hair dryers containing hoods or bonnets, infrared hair drying devices, electric hair curling tongs; Maintenance and repair of hairdressing appliances and instruments and animal shearing machines and instruments ]