Ice machine and r-7 rocket: what they have in common

1. Step 1. Ice machine — has part — Compressor. A refrigeration compressor.
2. Step 2. Compressor — is used in — Oxygen concentrator. A compressor.
3. Step 3. Oxygen concentrator — uses — Oxygen. Oxygen.
4. Step 4. Oxygen — is material for — R-7 rocket. The oxidizer is liquid oxygen.

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