Milking machine and electronic calculator: what they have in common

1. Step 1. Milking machine — uses — Vacuum. Vacuum milking.
2. Step 2. Vacuum — is used in — Cathode-ray tube. Inside is a vacuum.
3. Step 3. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.
4. Step 4. Monitor — has part — Liquid-crystal display. Then LCDs.
5. Step 5. Liquid-crystal display — is part of — Electronic calculator. An LCD display.

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