Ключевые слова: barb, carving, claw, clockwork, close up, cog, cogs, cogwheel, connecting, corrosion, device, gear, gearing, gray, grease, helical, helix, industry, iron, lubricant, lubrication, machinebuilding, machinery, macro, mechanics, mechanism, metal, metal surface, metallic, notch, old, pattern, pinion, prong, rust, rusty, screw, screw drive, screw thread, spiral, surface, technology, texture, textured, thread, tooth, transmission, wheel,