MacPherson strut and gutenberg printing press: what they have in common

1. Step 1. MacPherson strut — has part — Shock absorber. A shock absorber in the strut.
2. Step 2. Shock absorber — has part — Piston. Inside, a piston moves in oil.
3. Step 3. Piston — is part of — Watt steam engine. Steam pushes the piston in the cylinder.
4. Step 4. Watt steam engine — is part of — Rotary printing press. The first rotary presses were steam-driven.
5. Step 5. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.

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