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The Bipolar Junction Transistor (BJT) was invented by **John Bardeen**, **Walter Brattain**, and **William Shockley** in **1947** at Bell Labs. They were working together on improving the technology of amplifying signals. The BJT was a significant breakthrough because it could amplify electrical signals, and it eventually replaced vacuum tubes in many applications, leading to the development of modern electronics.
For their work, they were awarded the **Nobel Prize in Physics** in 1956.
For their work, they were awarded the **Nobel Prize in Physics** in 1956.