Electric stove and diesel engine: what they have in common

1. Step 1. Electric stove — has part — Heating element. Hotplates.
2. Step 2. Heating element — is part of — Espresso machine. A heater.
3. Step 3. Espresso machine — has part — Boiler. A boiler.
4. Step 4. Boiler — is part of — Excavator. The first excavators were steam-powered.
5. Step 5. Excavator — has part — Diesel engine. The drive is a diesel.

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