Steel works and truck: what they have in common

1. Step 1. Steel works — has part — Overhead crane. Overhead cranes.
2. Step 2. Overhead crane — has part — Block and tackle. A block and tackle.
3. Step 3. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
4. Step 4. Drilling rig — has part — Diesel engine. The drive.
5. Step 5. Diesel engine — is part of — Truck. A diesel engine.

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