Paperboard layer and rock drill: what they have in common

1. Step 1. Paperboard layer — is part of — Tetra Pak. Stiffness.
2. Step 2. Tetra Pak — is made of — Paper. Cardboard.
3. Step 3. Paper — is used in — Rotary printing press. It prints on a paper web.
4. Step 4. Rotary printing press — has part — Watt steam engine. The first rotary presses were steam-driven.
5. Step 5. Watt steam engine — has part — Piston. Steam pushes the piston in the cylinder.
6. Step 6. Piston — is part of — Rock drill. A percussion piston.

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