Rope and rolling mill: what they have in common

1. Step 1. Rope — is part of — Block and tackle. The rope runs around the pulleys.
2. Step 2. Block and tackle — is part of — Overhead crane. A block and tackle.
3. Step 3. Overhead crane — is part of — Steel works. Overhead cranes.
4. Step 4. Steel works — has part — Rolling mill. Rolling mills.

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