MicroLED and vacuum pump: what they have in common

1. Step 1. MicroLED — is a kind of — LED. LEDs.
2. Step 2. LED — is part of — Operating microscope. An illuminator.
3. Step 3. Operating microscope — is a kind of — Microscope. A microscope.
4. Step 4. Microscope — evolved into — Electron microscope. Overcoming the limit of optics.
5. Step 5. Electron microscope — has part — Vacuum pump. A vacuum in the column.

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