Leather bellows bag and watt steam engine: what they have in common

1. Step 1. Leather bellows bag — is part of — Bellows. It changes volume when squeezed.
2. Step 2. Bellows — has part — Check valve. An air intake valve.
3. Step 3. Check valve — is part of — Piston pump. Check valves direct the flow.
4. Step 4. Piston pump — evolved into — Watt steam engine. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.

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