Flat-screen TV and newcomen engine: what they have in common

1. Step 1. Flat-screen TV — evolved from — Television set. The picture tube was replaced by a panel.
2. Step 2. Television set — has part — Cathode-ray tube. A picture tube.
3. Step 3. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
4. Step 4. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.

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