For example, in the 1800s, the standardization of design of mechanical devices such as gears, pulleys, chains, and cams led to a manufacturing boom. In the 1900s, the gasoline engine led to innovations in automobiles, motorcycles, and airplanes. By the 1950s, it was the integrated circuit proliferating in numerous applications. In each of these cases, the development of complementary components led to a wave of inventions.
