Conveyor belt and autoclave: what they have in common

1. Step 1. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
2. Step 2. Tunnel boring machine — has part — Hydraulic cylinder. Hydraulic cylinders push the machine forward.
3. Step 3. Hydraulic cylinder — is part of — Excavator. Hydraulic cylinders move the boom and the bucket.
4. Step 4. Excavator — has part — Boiler. The first excavators were steam-powered.
5. Step 5. Boiler — is part of — Autoclave. A steam generator.

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