Elevator safety brake and heat pump: what they have in common

1. Step 1. Elevator safety brake — is part of — Elevator. Otis’s safety brakes.
2. Step 2. Elevator — has part — Pulley. The rope runs over a pulley.
3. Step 3. Pulley — is part of — Belt drive. The belt wraps around pulleys.
4. Step 4. Belt drive — is part of — Supercharger. Belt-driven from the crankshaft.
5. Step 5. Supercharger — is a kind of — Compressor. A supercharger.
6. Step 6. Compressor — is part of — Heat pump. A compressor.

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