Ключевые слова: circle, closeup, cluster gear, cogwheel, combine harvester, communication, concepts, connection, damaged, dirty, element, engine, engineering, equipment, gear, gearing, gearwheels, group objects, industry, machinery, mechanism, messy, metal, metallic, no people, old, part machine, pinion, rough, rust, rusted, rusty, scratched, shape, steel, symbol, technology, teeth, toothed, turning, vehicle, vintage, wheel,