37 repair and maintenance of abrasive tools; application preparation of abrasive tools on machine tools, namely grinding tools, tools for dressing, profiling, precision grinding, honing, cut of grinding, milling, drilling core drilling, and wire sawing; dressing and profiling of grinding tools, repair of maintenance of tools for dressing and profiling; maintenance of coolant-lubrication equipment of grinding machines; repair and maintenance of abrasive diamond tools for precision grinding, honing, cut-off grinding, milling, drilling, core drilling, wire sawing; repair and maintenance services, namely, renewal and optimization of the coolant-lubrication system with high performance grinding processes