Soldering iron and shipping container: what they have in common

1. Step 1. Soldering iron — has part — Heating element. A heater.
2. Step 2. Heating element — is part of — Washing machine. A heating element.
3. Step 3. Washing machine — has part — Shock absorber. Shock absorbers damp the drum's shaking during the spin.
4. Step 4. Shock absorber — is part of — Landing gear. Shock struts.
5. Step 5. Landing gear — is part of — Cargo aircraft. Landing gear for dirt airstrips.
6. Step 6. Cargo aircraft — uses — Shipping container. Air cargo containers.

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