Espresso machine and rolling mill: what they have in common

1. Step 1. Espresso machine — has part — Boiler. A boiler.
2. Step 2. Boiler — is part of — Steam hammer. A boiler supplies the steam.
3. Step 3. Steam hammer — evolved from — Trip hammer. The mechanization of forging.
4. Step 4. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
5. Step 5. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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