Bardeen–Brattain: the point-contact transistor

What changed

A semiconductor device could provide electronic amplification.

Scientific scope

The demonstrated point-contact semiconductor triode reported in 1948, not every later transistor technology.

Evidence

The cited historical record or published author account supports this scoped contribution. The source-reading boundary is stated at each link; a WRS grade is not an independent scientific validation.

Contributors

• John Bardeen; Walter Brattain · SCIENCE: The device and 1948 report.
• Bell Telephone Laboratories · INFRASTRUCTURE: Research setting; not an additional equal scientific author.

• Bardeen and Brattain: semiconductor triode

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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