Also playing a part in space development
After a rocket is launched, it gets jettisoned. It is a little-known fact that four coil springs are used to separate the first and second stages. They play a role in assisting the separation by jetting, and since they need to be light and rust-resistant, titanium alloys are used. Springs are also used to open the antennas of artificial satellites. Springs are used in automobiles, telecommunications equipment, and in all aspects of industrial and daily life, and they play a role not only in familiar products, but also in cutting-edge space development.