Crane jib and rolling mill: what they have in common

1. Step 1. Crane jib — is part of — Portal crane. A slewing jib.
2. Step 2. Portal crane — is a kind of — Tower crane. A crane.
3. Step 3. Tower crane — has part — Block and tackle. The load is lifted with a block and tackle.
4. Step 4. Block and tackle — is part of — Overhead crane. A block and tackle.
5. Step 5. Overhead crane — is part of — Steel works. Overhead cranes.
6. Step 6. Steel works — has part — Rolling mill. Rolling mills.

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