First of all, after the second world war, the need for cutting complex parts in aircraft production in the USA emerged. Because cutting metal parts of airplanes was both difficult and not suitable for mass production. It was first produced by Parsons Company as a milling machine and took its place in history. However, the frequent malfunctions of the machines made it necessary to add electronic tubes and circuits to the machines, and after a while, it became possible to store memory in CNC machines.