Mass spectrometer and car: what they have in common

1. Step 1. Mass spectrometer — has part — Vacuum pump. A vacuum system.
2. Step 2. Vacuum pump — evolved into — Boyle’s air pump. An improved version of Guericke’s pump.
3. Step 3. Boyle’s air pump — has part — Rack and pinion. A rack and pinion moves the piston.
4. Step 4. Rack and pinion — is part of — Car. The steering gear is a rack and pinion.

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