Compressor and bellows: what they have in common

1. Step 1. Compressor — is part of — Ventilator. A compressor or turbine.
2. Step 2. Ventilator — has part — Valve. Valves.
3. Step 3. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.

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