Parking sensor and elevator: what they have in common

1. Step 1. Parking sensor — works like — Sonar. Echolocation in air.
2. Step 2. Sonar — is part of — Submarine. Underwater acoustics.
3. Step 3. Submarine — has part — Ballast tank. Ballast tanks.
4. Step 4. Ballast tank — is made of — Wrought iron. The tanks are iron.
5. Step 5. Wrought iron — is material for — Elevator safety brake. The safety catches are wrought iron.
6. Step 6. Elevator safety brake — is part of — Elevator. Otis’s safety brakes.

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