Potter’s wheel and diesel engine: what they have in common

1. Step 1. Potter’s wheel — has part — Axle. A vertical axis.
2. Step 2. Axle — is part of — Wheelset. A common axle.
3. Step 3. Wheelset — is part of — Bogie. The bogie carries the wheelsets.
4. Step 4. Bogie — is part of — Diesel locomotive. Bogies with wheelsets.
5. Step 5. Diesel locomotive — has part — Diesel engine. The diesel turns a generator.

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