Display and dewar flask: what they have in common

1. Step 1. Display — is part of — Monitor. The heart of a monitor is the display: an LCD panel, once a picture tube.
2. Step 2. Monitor — has part — Cathode-ray tube. The first monitors were CRTs.
3. Step 3. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
4. Step 4. Vacuum — is used in — Dewar flask. A vacuum.

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