Pesticide and transformer: what they have in common

1. Step 1. Pesticide — uses — Aerosol can. In 1941 insecticide began to be sprayed from aerosol cans, the "bug bombs" made for soldiers; after the war the same can was used for hair spray.
2. Step 2. Aerosol can — has part — Valve. A valve.
3. Step 3. Valve — is part of — Ventilator. Valves.
4. Step 4. Ventilator — is part of — Ambulance. Medical equipment.
5. Step 5. Ambulance — has part — Defibrillator. A defibrillator.
6. Step 6. Defibrillator — has part — Transformer. Stepping up the voltage.

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