Radar and tunnelling shield: what they have in common

1. Step 1. Radar — is used in — Airport. Radars.
2. Step 2. Airport — has part — Jet bridge. Jet bridges.
3. Step 3. Jet bridge — has part — Hydraulic cylinder. Raising the bridge.
4. Step 4. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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