Drum and truck: what they have in common

1. Step 1. Drum — works like — Drum machine. An electronic drum.
2. Step 2. Drum machine — has part — Oscillator. Analogue oscillators.
3. Step 3. Oscillator — has part — Capacitor. An LC circuit.
4. Step 4. Capacitor — is part of — Defibrillator. The energy of the shock is stored in a capacitor.
5. Step 5. Defibrillator — is part of — Ambulance. A defibrillator.
6. Step 6. Ambulance — evolved from — Truck. A special-purpose vehicle.

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