Turbine runner and electric motor: what they have in common

1. Step 1. Turbine runner — is part of — Water turbine. Blades turned by the flow.
2. Step 2. Water turbine — evolved from — Water wheel. The turbine is a development of the water wheel.
3. Step 3. Water wheel — is used in — Rolling mill. The first mills were turned by water.
4. Step 4. Rolling mill — has part — Electric motor. The drive.

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