Clothes peg and conveyor belt: what they have in common

1. Step 1. Clothes peg — has part — Spring. A spring.
2. Step 2. Spring — is part of — Bogie. Spring suspension.
3. Step 3. Bogie — has part — Ball bearing. Axle boxes with roller bearings.
4. Step 4. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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