Hydraulic press and rolling mill: what they have in common

1. Step 1. Hydraulic press — includes — Forging press. A press.
2. Step 2. Forging press — evolved from — Steam hammer. Pressing instead of striking.
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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