Ironing board and rock drill: what they have in common

1. Step 1. Ironing board — is used in — Electric iron. Ironing.
2. Step 2. Electric iron — has part — Heating element. A heater.
3. Step 3. Heating element — is part of — Washing machine. A heating element.
4. Step 4. Washing machine — has part — Shock absorber. Shock absorbers damp the drum's shaking during the spin.
5. Step 5. Shock absorber — has part — Piston. Inside, a piston moves in oil.
6. Step 6. Piston — is part of — Rock drill. A percussion piston.

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