Rack and pinion and bellows: what they have in common

1. Step 1. Rack and pinion — is part of — Boyle’s air pump. A rack and pinion moves the piston.
2. Step 2. Boyle’s air pump — evolved from — Vacuum pump. An improved version of Guericke’s pump.
3. Step 3. Vacuum pump — has part — Check valve. Valves stop air from flowing back.
4. Step 4. Check valve — is part of — Bellows. An air intake valve.

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