Timeline Wednesday 30 June 1948

Events on Wednesday 30 June 1948 1

• 1948 The transistor is publicly announced Bell Labs unveils the device that will replace the vacuum tube On June 30, 1948, Bell Telephone Laboratories publicly announced the transistor, invented the previous December by John Bardeen, Walter Brattain, and William Shockley. The tiny solid-state device could amplify and switch electronic signals far more efficiently than the vacuum tubes it would eventually replace. It became the foundation of virtually all modern electronics.