Harmonica comb and newcomen engine: what they have in common

1. Step 1. Harmonica comb — is part of — Harmonica. Air channels.
2. Step 2. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
3. Step 3. Accordion — has part — Bellows. Bellows.
4. Step 4. Bellows — has part — Check valve. An air intake valve.
5. Step 5. Check valve — is part of — Piston pump. Check valves direct the flow.
6. Step 6. Piston pump — is part of — Newcomen engine. The beam drove a mine pump.

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