Space under floor on brick pillars and rolling mill: what they have in common

1. Step 1. Space under floor on brick pillars — is part of — Hypocaust. A space under the floor on brick pillars.
2. Step 2. Hypocaust — is made of — Brick. The pillars of a hypocaust are brick.
3. Step 3. Brick — is material for — Open-hearth furnace. An open-hearth furnace is built of firebrick.
4. Step 4. Open-hearth furnace — is part of — Steel works. A steelmaking shop.
5. Step 5. Steel works — has part — Rolling mill. Rolling mills.

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