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The first working transistor, built at Bell Labs in December 1947, was made from which semiconductor?

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  1. Silicon
  2. Gallium arsenide
  3. Germanium

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References

  1. Computer History Museum, 1947: Invention of the Point-Contact Transistor www.computerhistory.org/siliconengine/invention-of-the-point-contact-transistor Checked 2026-10-10.

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