Diving suit and tunnelling shield: what they have in common

1. Step 1. Diving suit — has part — Piston pump. Air was pumped from the surface.
2. Step 2. Piston pump — is part of — Concrete pump. A piston pump.
3. Step 3. Concrete pump — has part — Hydraulic cylinder. Hydraulics.
4. Step 4. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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