One-chip computer, logical circuit, audio frequency and video processor, Diode, Triode.

单片机，逻辑电路，音视频处理器，二、三极管。

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To create the point-contact transistor, Shockley's team modified the cat's whisker by placing two fine metal wires close together on the surface of a germanium crystal, turning it from a diode into a triode.

ECONOMIST: The middle age of the transistor