Ключевые слова: agricultural, antique, closeup, cog, cogwheel, drive, engine, engineering, equipment, force, gear, gearing, gears, grease, green, grinding, historic, historical, industrial, industry, iron, isolated, jump, machine, machinery, mechanical, mechanics, mechanism, mechanisms, metal, old, part, power, powertrain, precision, quality control, reduction, robust, rust, shaft, steel, sturdy, support, technical, technology, transmission, wheel, workplace, workshop, worm,