Surgical gloves and tunnelling shield: what they have in common

1. Step 1. Surgical gloves — is made of — Natural rubber. Latex.
2. Step 2. Natural rubber — is material for — Spray bottle. A rubber bulb.
3. Step 3. Spray bottle — has part — Piston pump. A hand pump.
4. Step 4. Piston pump — is part of — Concrete pump. A piston pump.
5. Step 5. Concrete pump — has part — Hydraulic cylinder. Hydraulics.
6. Step 6. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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