Ключевые слова: ancient, background, ball, ball bearing, bearing, broken, chock, closeup, component, corrosion, damage, decay, device, dirty, engineer, engineering, equipment, grease, grease stain, hardware, heavy, industry, iron, machine, machinery, maintenance, mechanical, metal, object, oil, old, oxidation, part, pivoted, repair, replacement, roller, rolling, round, rust, rusty, rusty metal, service, steel, technical, technology, tool, vehicle, wheel,