Steel plough and rope: what they have in common

1. Step 1. Steel plough — is used in — Tractor. Ploughing with a tractor.
2. Step 2. Tractor — has part — Diesel engine. A diesel.
3. Step 3. Diesel engine — is part of — Drilling rig. The drive.
4. Step 4. Drilling rig — has part — Block and tackle. The block and tackle lifts the drill string.
5. Step 5. Block and tackle — has part — Rope. The rope runs around the pulleys.

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