Player piano and electric motor: what they have in common

1. Step 1. Player piano — has part — Bellows. Pedal bellows create suction.
2. Step 2. Bellows — is part of — Blast furnace. Air was blown in by bellows, later by blowers.
3. Step 3. Blast furnace — is part of — Steel works. Blast furnaces.
4. Step 4. Steel works — has part — Rolling mill. Rolling mills.
5. Step 5. Rolling mill — has part — Electric motor. The drive.

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