Fire extinguisher and programmable logic controller: what they have in common

1. Step 1. Fire extinguisher — has part — Valve. A shut-off device.
2. Step 2. Valve — is part of — Gas stove. Gas taps.
3. Step 3. Gas stove — uses — Natural gas. The fuel is gas.
4. Step 4. Natural gas — uses — Pipeline. Gas is transported through pipes.
5. Step 5. Pipeline — is part of — Chemical plant. Pipelines between the vessels.
6. Step 6. Chemical plant — has part — Programmable logic controller. Process control automation.

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