Transistor

Patented in 1962

A semiconductor device used to amplify or switch electronic signals and electrical power. Bipolar and darlington 2 main types of transistors.

Predecessor of all transistors to come

Invented by Julius Edgar Lilienfeld

Refrences

https://en.wikipedia.org/wiki/Transistor#targetText=A%20transistor%20is%20a%20semiconductor,connection%20to%20an%20external%20circuit.