Defibrillator and centrifugal pump: what they have in common

1. Step 1. Defibrillator — is part of — Ambulance. A defibrillator.
2. Step 2. Ambulance — has part — Ventilator. Medical equipment.
3. Step 3. Ventilator — has part — Compressor. A compressor or turbine.
4. Step 4. Compressor — has part — Impeller. A centrifugal compressor is an impeller.
5. Step 5. Impeller — is part of — Centrifugal pump. The impeller accelerates the liquid.

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