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December 1947General sourceWell documented

The transistor is invented at Bell Labs

On the timeline · around December 1947 · The transistor is invented at Bell Labs1942194419461948195019521954

What happened

Bardeen, Brattain, and Shockley demonstrated the first transistor — a solid-state switch that would replace the vacuum tube.

Why it matters

The most manufactured device in human history; every chip is billions of its descendants.

Sources

The transistor is invented at Bell Labs — A Timeline of the Internet & Computing · SourcedStory