Reflow soldering and conveyor belt: what they have in common

1. Step 1. Reflow soldering — uses — Solder. Solder paste.
2. Step 2. Solder — is used in — Soldering iron. Solder.
3. Step 3. Soldering iron — has part — Heating element. A heater.
4. Step 4. Heating element — is part of — Washing machine. A heating element.
5. Step 5. Washing machine — has part — Ball bearing. Drum bearings.
6. Step 6. Ball bearing — is part of — Conveyor belt. The rollers turn on bearings.

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