Zener diode and monitor: what they have in common

1. Step 1. Zener diode — is a kind of — Diode. A diode.
2. Step 2. Diode — evolved from — Vacuum tube. The first diode was a vacuum tube (Fleming); later diodes became semiconductor devices.
3. Step 3. Vacuum tube — includes — Cathode-ray tube. An electron vacuum device.
4. Step 4. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.

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