Grill air vents and jacquard loom: what they have in common

1. Step 1. Grill air vents — is part of — Grill. They regulate the airflow.
2. Step 2. Grill — uses — Charcoal. Charcoal.
3. Step 3. Charcoal — is used in — Bloomery. The ore was reduced with charcoal.
4. Step 4. Bloomery — has part — Bellows. Bellows blew in air for a high temperature.
5. Step 5. Bellows — is part of — Player piano. Pedal bellows create suction.
6. Step 6. 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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