Ключевые слова: abrasive, blade, circle, corrund, cut, cutting, design, dirt, disc, drill, electric, engineering, equipment, factory, fittings, foreman, garbage, heat, human, industry, iron, labor, machine, maintenance, material, metal, noise, operator, plant, precision, process, processing, production, protection, repair, rotation, safety, saw, shavings, spark, sparks, steel, technology, temperature, tool, welding, work, worker, workplace, workshop,