Canvas stretcher bed and electric fan: what they have in common

1. Step 1. Canvas stretcher bed — is part of — Stretcher. Cloth between the poles.
2. Step 2. Stretcher — is part of — Ambulance. A stretcher.
3. Step 3. Ambulance — has part — Ventilator. Medical equipment.
4. Step 4. Ventilator — has part — Compressor. A compressor or turbine.
5. Step 5. Compressor — has part — Impeller. A centrifugal compressor is an impeller.
6. Step 6. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

Open Evothings