Ключевые слова: background, business, circle, cog, cogwheel, communication, concept, connection, construction, cooperation, design, element, engine, engineering, equipment, factory, gear, icon, idea, industrial, industry, machine, machinery, mechanic, mechanical, mechanics, mechanism, metal, motion, part, pinion, power, progress, round, shape, sign, spin, steel, strength, symbol, team, teamwork, technical, technology, teeth, tool, toothed, transmission, wheel, work,