Metal reeds and rolling mill: what they have in common

1. Step 1. Metal reeds — is part of — Harmonica. Metal reeds vibrate in a flow of air.
2. Step 2. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
3. Step 3. Accordion — has part — Bellows. Bellows.
4. Step 4. Bellows — is part of — Blast furnace. Air was blown in by bellows, later by blowers.
5. Step 5. Blast furnace — is part of — Steel works. Blast furnaces.
6. Step 6. Steel works — has part — Rolling mill. Rolling mills.

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