X-ray machine and pneumatic tube: what they have in common

1. Step 1. X-ray machine — has part — Vacuum tube. An X-ray tube.
2. Step 2. Vacuum tube — uses — Vacuum. Electrons fly in an evacuated bulb.
3. Step 3. Vacuum — is used in — Hyperloop (concept). A vacuum in the tube.
4. Step 4. Hyperloop (concept) — was inspired by — Pneumatic tube. Capsules in a tube — pneumatic post for people.

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