Valve and tank: what they have in common

1. Step 1. Valve — is part of — Ventilator. Valves.
2. Step 2. Ventilator — has part — Compressor. A compressor or turbine.
3. Step 3. Compressor — is part of — Gas turbine. A compressor.
4. Step 4. Gas turbine — is part of — Tank. Some tanks (T-80, Abrams) have a gas turbine engine.

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