Armour and rolling mill: what they have in common

1. Step 1. Armour — evolved from — Plate armour. Armour moves from people to machines.
2. Step 2. Plate armour — has part — Rivet. Movable plates on rivets.
3. Step 3. Rivet — is part of — Steel frame. Early frames were riveted.
4. Step 4. Steel frame — has part — I-beam. I-beams.
5. Step 5. I-beam — uses — Rolling mill. Rolling.

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