UNIVAC I and boiler: what they have in common

1. Step 1. UNIVAC I — has part — Vacuum tube. Vacuum tubes.
2. Step 2. Vacuum tube — uses — Vacuum. Electrons fly in an evacuated bulb.
3. Step 3. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.
4. Step 4. Newcomen engine — has part — Boiler. Steam from the boiler.

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