Tunnel lining segments and radar: what they have in common

1. Step 1. Tunnel lining segments — is part of — Tunnelling shield. Lining segments installed behind the shield.
2. Step 2. Tunnelling shield — uses — Hydraulic cylinder. The shield was pushed forward by jacks.
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 — Radar. Radars.

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