Ключевые слова: abstract, background, cog, concept, connect, connection, design, drive gear, energy, engine, engineering, equipment, factory, gear, gear wheel, gearing, industrial, industry, involute, machine part, machine tool, machinery, mechanic, mechanical, mechanism, metal, module, movement, old, part, power, redhot tempering, repair, service, steel, technical, technology, teeth, template, tool, transportation, vehicle, wheel, work, work of mechanisms,