Stretcher poles and atomic clock: what they have in common

1. Step 1. Stretcher poles — is part of — Stretcher. Two lengthwise handles.
2. Step 2. Stretcher — is part of — Ambulance. A stretcher.
3. Step 3. Ambulance — has part — Defibrillator. A defibrillator.
4. Step 4. Defibrillator — has part — Capacitor. The energy of the shock is stored in a capacitor.
5. Step 5. Capacitor — is part of — Oscillator. An LC circuit.
6. Step 6. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.

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