Ключевые слова: circle, cog, cogwheel, cogwheels, concept, conceptual, connect, connection, drive, element, engine, engineering, equipment, gear, gears, gray, group, heavy, industrial, industry, iron, large, machine, machinery, mechanical, mechanics, mechanism, metal, metallic, objects, old, part, power, round, rust, rusty, set, solid, spin, steel, teamwork, technology, teeth, transmission, view, wheel, work, worn,