Door closer and radio: what they have in common

1. Step 1. Door closer — uses — Hydraulics (Pascal’s law). Hydraulic damping.
2. Step 2. Hydraulics (Pascal’s law) — is used in — Hydraulic cylinder. The liquid transmits pressure to the piston.
3. Step 3. Hydraulic cylinder — is part of — Jet bridge. Raising the bridge.
4. Step 4. Jet bridge — is part of — Airport. Jet bridges.
5. Step 5. Airport — uses — Air traffic control. Air traffic control.
6. Step 6. Air traffic control — uses — Radio. Radio communication.

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