Trowel and rolling mill: what they have in common

1. Step 1. Trowel — is used in — Brick. Bricklaying with a trowel.
2. Step 2. Brick — is material for — Open-hearth furnace. An open-hearth furnace is built of firebrick.
3. Step 3. Open-hearth furnace — is part of — Steel works. A steelmaking shop.
4. Step 4. Steel works — has part — Rolling mill. Rolling mills.

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