37 Installation, maintenance and repair of machine tools, namely, powered machines for cutting or shaping or finishing metals or other materials, grinding machines, namely, external and internal cylindrical grinding machines, centerless grinding machines, camshaft and noncircular grinding machines, crankshaft grinding machines, flat and profile grinding machines, and automatic grinding machines, superfinishing machines, honing machines, laser machine tools, eroding machines, laser machines, tool grinding machines, universal cylindrical grinding machines, plunge grinding machines, high-speed grinding machines, external and internal thread grinding machines, notch grinding machines, polygon grinding machines, roll grinding machines, production grinding machines, namely, powered machines for cutting or shaping or finishing metals or other materials, parts and accessories for grinding machines, namely, work holders, cutters for cutting or shaping or finishing metals or other materials, cutting blades, chipper blades, boring bars, crimping anvils, core hole drills, forstner drills, variable helix drills, step drills, reamers, routers and toroid cutters, and grinding machines and laser machine tools for metalworking, analysis instruments, namely, water quality analyzers and gas analyzers not for medical purposes, measuring instruments, namely, electric measuring devices, precision measuring apparatus, current meters, electromechanical level gauges, and automatic detectors, electrical, magnetic and optical measuring and test equipment, namely, electric measuring devices, precision measuring apparatus, current meters, electromechanical level gauges, and automatic detectors, measuring machines, namely, automatic non-contact inspection machines for measuring cutting tools including rake angles, helix angles, leads, relief angles and profile scans, automatic non-contact inspection machines for measuring grinding wheels, and automatic non-contact measuring machines for measuring profiles, control systems comprising electronic controls, optical controls and computer controls for grinding machines and laser machine tools, electric measuring devices, precision measuring apparatus, current meters, electromechanical level gauges, and automatic detectors, and control systems comprising electronic control systems for grinding machines and laser machine tools; installation and maintenance of powered machines for cutting or shaping or finishing metals or other materials