Check valve and steam locomotive: what they have in common

1. Step 1. Check valve — is part of — Piston pump. Check valves direct the flow.
2. Step 2. Piston pump — evolved into — Watt steam engine. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.
3. Step 3. Watt steam engine — is part of — Steam locomotive. A steam locomotive is driven by a steam engine.

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