Stretcher and headphones: what they have in common

1. Step 1. Stretcher — is part of — Ambulance. A stretcher.
2. Step 2. Ambulance — has part — Defibrillator. A defibrillator.
3. Step 3. Defibrillator — has part — Transformer. Stepping up the voltage.
4. Step 4. Transformer — has part — Copper wire. Windings.
5. Step 5. Copper wire — is part of — Headphones. A cable.

Open Evothings