Ironing board top and pneumatic tube: what they have in common

1. Step 1. Ironing board top — is part of — Ironing board. A perforated board.
2. Step 2. Ironing board — is used in — Electric iron. Ironing.
3. Step 3. Electric iron — has part — Thermostat. A thermostat.
4. Step 4. Thermostat — is part of — Refrigerator. A thermostat.
5. Step 5. Refrigerator — has part — Compressor. A compressor with an electric motor.
6. Step 6. Compressor — is part of — Pneumatic tube. A pressure or vacuum blower.

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