Wheelchair and paper machine: what they have in common

1. Step 1. Wheelchair — has part — Ball bearing. Bearings.
2. Step 2. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.
3. Step 3. Conveyor belt — works like — Paper machine. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.

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