Ключевые слова: 3d, black, business, circle, cog, cogwheel, collection, concept, connection, cooperation, design, element, engine, engineering, equipment, factory, gear, illustration, industrial, industry, machine, machinery, mechanical, mechanics, mechanism, metal, motion, part, power, progress, rendering, rotate, round, set, sign, silver, spin, steel, steering, symbol, teamwork, technical, technology, teeth, tool, transmission, turn, web, wheel, work,