Pulley and refrigerator: what they have in common

1. Step 1. Pulley — is part of — Belt drive. The belt wraps around pulleys.
2. Step 2. Belt drive — is part of — Supercharger. Belt-driven from the crankshaft.
3. Step 3. Supercharger — is a kind of — Compressor. A supercharger.
4. Step 4. Compressor — is part of — Refrigerator. A compressor with an electric motor.

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