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Today in History: William Shockley announces groundbreaking junction transistor

7/4/2026

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Summary

Story summary

On July 4, 1947 William Shockley publicly disclosed the junction transistor his Bell Labs team—John Bardeen and Walter Brattain—had created, a solid-state device that amplified current using semiconductor junctions. The breakthrough replaced bulky vacuum tubes and earned the trio the 1956 Nobel Prize in Physics.

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Story summary

On July 4, 1947 William Shockley publicly disclosed the junction transistor his Bell Labs team—John Bardeen and Walter Brattain—had created, a solid-state device that amplified current using semiconductor junctions. The breakthrough replaced bulky vacuum tubes and earned the trio the 1956 Nobel Prize in Physics.