Oxygen concentrator and jacquard loom: what they have in common

1. Step 1. Oxygen concentrator — has part — Valve. They switch the columns.
2. Step 2. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.
3. Step 3. Bellows — is part of — Player piano. Pedal bellows create suction.
4. Step 4. Player piano — works like — Jacquard loom. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.

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