Landing gear and vacuum pump: what they have in common

1. Step 1. Landing gear — has part — Shock absorber. Shock struts.
2. Step 2. Shock absorber — has part — Piston. Inside, a piston moves in oil.
3. Step 3. Piston — is part of — Boyle’s air pump. A plunger.
4. Step 4. Boyle’s air pump — evolved from — Vacuum pump. An improved version of Guericke’s pump.

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