Mechanical engineers are involved in research and development, design, manufacturing, and technical sales of a wide variety of products. Specific areas of involvement include computer-aided design and manufacturing, robotics, power plants, engines, materials, automotive vehicles and systems of transportation, industrial equipment, control and measurement devices, instrumentation, biomedical devices, apparatus for the control of air, water, noise, refuse, and other types of pollution; underwater technology, space flight equipment, and safety devices and sensors.