Barrel organ and oil lamp: what they have in common

1. Step 1. Barrel organ — has part — Bellows. Bellows feed air into the pipes.
2. Step 2. Bellows — is part of — Bloomery. Bellows blew in air for a high temperature.
3. Step 3. Bloomery — is made of — Clay. A bloomery is a clay shaft.
4. Step 4. Clay — is material for — Oil lamp. Later — clay ones.

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