Coal mine and car: what they have in common

1. Step 1. Coal mine — is used in — Newcomen engine. Pumping water out of mines.
2. Step 2. Newcomen engine — has part — Boiler. Steam from the boiler.
3. Step 3. Boiler — is part of — Steam carriage. A boiler.
4. Step 4. Steam carriage — evolved into — Car. Self-propelled vehicles before the combustion engine were steam-powered.

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