Paper reel and electric fan: what they have in common

1. Step 1. Paper reel — is part of — Paper machine. It winds the paper into a roll.
2. Step 2. Paper machine — has part — Belt drive. The wire moves on belts and rolls.
3. Step 3. Belt drive — is part of — Supercharger. Belt-driven from the crankshaft.
4. Step 4. Supercharger — is a kind of — Compressor. A supercharger.
5. Step 5. Compressor — has part — Impeller. A centrifugal compressor is an impeller.
6. Step 6. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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