If you ever used an automatic elevator in your lifetime reducing time and the thought of taking flights of stairs to the top floor, you can give all thanks to African-American inventor Alexander Miles. However, before Miles created automatic doors, the use of lift elevators that are still used today at construction sites was complicated and risky people had to manually shut both the shaft and elevator doors before riding.
Forgetting to do so led to multiple accidents as people fell down elevator shafts. When the daughter of inventor Alexander Miles almost fatally fell down the shaft, he took it upon himself to develop a solution. In 1887 he took out a patent for a mechanism that automatically opens and closes elevator shaft doors and his designs are largely reflected in elevators used today according to History.com.